If price is not an issue, I would recommend a Cisco router and switch for reliability and performance.
For example, a new cisco 1861 router with a T1 HWIC would be good and a Cisco Cat 2960 switch.
However, I am sure that there are a ton of great options out there that wouldn’t cost a lot and would serve 8 PC’s on a T1 just fine.
I hope that helps. Feel free to contact me if you have more questions.