Honestly, your question is a bit open ended to get responses that are specific to your situation. Help us out by telling us what kind of ports your PC has, how many mic pres you want/need, and your budget.
If you don't have Thunderbolt, then that makes it easy - don't get something with that. There are lots of USB 2.0 interfaces still out there in a wide range of prices, depending on manufacturer, how many mic pres, etc. I'd just filter at the online sites based on your criteria, look over the results, pick a few with a lot of good reviews, and then start to narrow down.