Need recommendation for a routing network switch

I have an Arris SURFboard cable modem SB8200 and am very happy with it, BUT when I connected my Netgear GS605 5 port switch via a Cat6 cable, the switch will NOT work.  The cable modem is perfectly fine as I can connect it directly to my main computer and get my gigabit speeds.  I called Arris Tech Support and made my way to their upper level tech support.  After our troubleshooting, their conclusion was that I needed a new switch.  

They said I need a routing switch or any layer 3 switch. They mentioned something about it handling DHCP.  There are so many switches out there, can you please recommend a medium to high quality switch at a moderate price.  The goal, of course is for the switch to be able to utilize and deliver the full gigabit speed the cable modem has to the switch and thus throughout my hard wired Cat6 home network.  Thanks.
ArtG2521Asked:
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JohnBusiness Consultant (Owner)Commented:
That is a simple minded switch and should work fine.

Do a hardware reset to set it back to factory specs, make sure your Arris modem has been configured to supply DHCP, and hook the Switch up to a LAN port (not the WAN port).

If you have the Arris modem in Bridge Mode, you need a router, not a switch.
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ArtG2521Author Commented:
The cable modem has only two gigabit ports out.  One is running into my Arris SURFboard SBR-AC1750 wifi router, via the blue WAN port. Port 2 is empty. The router has 4 ports out.  One runs into my main computer and one into my Netgear switch.  This configuration works fine EXCEPT the speed drops down from 800-850 gigabits per second to 500-550.  The Arris tech said the router will lose up to 35% of the speed coming from the modem.  If true, that checks out and I CAN live with this.  HOWEVER, I asked him if I can connect port 2 on the modem directly to the switch for optimum speed and performance, he said yes.  He asked what switch I had (Netgear) and did the research on it and said it would not work and to get a routing switch or any layer 3 switch.

I did a power reset AND a factory reset of the modem (more than once) and it still will NOT work with the Netgear switch.  HOWEVER, in the configuration I mentioned above, it works fine.  In addition, he recommended some switches he liked (see below) however, I wanted to see what the techs at EE had to say.

This is EXACTLY what the Arris tech said:

I was able to find this list of Layer 3 switches, known as Routing Switches.
These are CISCO switches:
3550
3560
3750
4500
6500
7000

These are the recommended models, but any routing switch or any layer 3 switch will be able to complete the process. Remember this is just a recommendation to upgrade your connection.
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JohnBusiness Consultant (Owner)Commented:
Any of the Cisco switches above will work. It sounds that perhaps your Netgear switch is defective.

I have used little 3-Com switches like the Netgear and they work fine with no drop in throughput speed.
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ArtG2521Author Commented:
The drop in speed is NOT from the switch, it is from the wifi router.  My main computer does NOT run through the switch but straight from the router ports and the speed is reduced just as the Arris tech stated.  The other computers in the house run from the switch (also from the router ports) and get the same reduced speeds.  It seems I will have to live with this or spend more money on a higher end switch.
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JohnBusiness Consultant (Owner)Commented:
The drop in speed is NOT from the switch, it is from the wifi router

Probably the same throughput issue. I use a Cisco RV134AC wireless router with 800 Mbits/sec internal throughput and it does not reduce speed.
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ArtG2521Author Commented:
In your opinion, will the Cisco switch solve the problem as the Arris tech said?  Enabling the highest speeds direct from the cable modem to the switch?
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JohnBusiness Consultant (Owner)Commented:
Most likely yes. I use standard high speed routers and switches in my own network and they work fine. I had an Arris modem which worked fine and the ISP changed it to a Hitron modem which also works fine
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ArtG2521Author Commented:
I think I may have to live with my current config, as even the refurb Ciscos are just too expensive.  Thanks for your help.
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JohnBusiness Consultant (Owner)Commented:
OK and thanks for the update
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