Cisco switch hardware recommendation for VoIP/VLAN/QoS/PoE requirement

currently have 85 users scaling up to 130 users with an interal SIP(VoIP) solution being implemented.

Need to replace our switching hardware to offer PoE for the sip phones...  the VLAN/QoS requirement should be common on most Cisco switches I would assume, though any specific IOS versions to ensure this is desired.

Looking at 30-40 of the users being on one floor (7th), and the balance being on another floor (3rd).  Network/server room is on the 7th floor, though we can locate switching equipment on the 3rd.

Currently considering a 3560 or 3570 on the 7th floor (48 port for the 30-40 up there) and two additional 3560 or 3570's on the 3rd floor (2x48 port for the 55-90 down there).  Would also assume some sort of fibre modules/cables in the GBIC expansion ports for switch backbone commnunication.

Looking for someone current on Cisco hardware to recommend the switch, interconnecting hardware, and any specific IOS recommendations if required.

Thanks in advance.
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daveathsAsked:
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from_expCommented:
you can got with 3750 only. the do have stacking, so you can stack several switches together.
still it is possible to use cisco 2960 switches they are L2 only, but in most cases it is enough.
still 3750 is better to my mind. with base license they can do L2 with simple L3 with rip
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daveathsAuthor Commented:
Assuming the 3750...

what modules should we purchase for the "stacking" given that our interconnect between the two floors has to cover a run of 105-125 feet

any particular IOS versions for this that we should be looking at?
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from_expCommented:
ios version - latest.
feature pack - standard - with rip only, extended - with bgp and ospf.
the only way to connect two flours in your case - fiber line with sfps. stacking cables are 5m long at maximum, because these cables can work with 10-40G speeds, they are copper, so they are very limited in length
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from_expCommented:
stacking is useful within wiring closets, when you need 30+ ports to connect. in this case you take 2 stacked 24 port switches and use some 2 or 4 uplink ports to connect to your main switch
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daveathsAuthor Commented:
so let me feed this back...  

one 5075-48port on the 7th floor, two 5075-48 port on the 3rd floor, all three switches loaded with SFP fibre modules to handle the back and forth between the switches?

if the above is correct, what SFPs do you recommend we use?

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from_expCommented:
yes, correct (but I don't know what 5075-48 is )
I would recommend original sfps.
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daveathsAuthor Commented:
sorry, bit of dyslexia there, 3750-48.

In regards to the sfps, the question was which modules...  specifically.
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from_expCommented:
depends on your fiber lines.
it is possible you have two fibers or single(WDM).
then is it multimode(SX) or single mode(LX or LH).
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