Router to do port redirection (not just forwarding)

I'm looking for a router that does nat and port redirection, not just forwarding. For instance, if I have three computers each running vnc on port 5900 and their nat addresses are 192.168.0.5, 192.168.0.6 and 192.168.0.7, I want to be able to address them from outside by: RouterAddress:5905, RouterAddress:5906 and RouterAddress:5907 and have the router redirect that traffic to the appropriate computer on port 5900.

I know I've seen this in IBM Lotus Foundations Server and in Net Integration's Nitix, but does there exist a (relatively inexpensive) piece of hardware that can do this?

Thanks.
1_21gigawattsAsked:
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1_21gigawattsConnect With a Mentor Author Commented:
So, this was easier than I thought - I just looked through my pile of routers and found (among the various Ciscos, which are way too expensive for this application) a Netgear WNR2000 which handles the task just fine, and for $45 I don't think I'll find anything better.
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NE_Tech_DudeCommented:
If you are not opposed to using a firewall to act as your router you should look into the Cisco ASA line.  The Cisco 5505 firewall can do port redirection like this as well as handle routing.  It's a solid security device.  It's price point is larger than your soho routers, but you get the extra benefit of security and a handful of application layer inspection as well.  Plus, Client to Site and Site to Site pinnups!  going for 250-400$ on Amazon currently.
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max_the_kingCommented:
hi,
should you not want to use a firewall, you can do port redirection with any cisco router of the series, 800, 1900 and greater.
Cisco 887 is cheap but solid enough to do the job.
here is a link you may want to read:
http://www.cisco.com/en/US/products/hw/routers/ps380/index.html

hope this helps
max
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1_21gigawattsAuthor Commented:
This router does just what I need, and doesn't cost an arm & a leg or need any complicated setup. And, it's available at microcenter and staples.
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