Just about any off the shelf router purchased at you local electronics store should do the trick just fine. Pretty much all contain a firewall due to the nature of NAT (Network Address Translation). I would personally recommend Linksys, although DLink also makes a fairly decent router from what I've heard. I would stay away from Netgear, most of their residential routers do NOT support loopback. Without loopback support you will not be able to get to your website's internally using an external domain/IP.
To give you any model recommendations, I need to know whether you need wireless or not. Also, what brand/model is your current DSL modem? Just wondering since most DSL modems these days comes with a built-in router (NAT).
Hopefully that helps, let me know if you need any other specifics.
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