Best RCA interconnect up to ~$100?

If you’re just starting out, my advice is to buy a pair of ICs from Blue Jeans cable and listen for a year. Then you can try something more expensive and see if it makes a difference in your system. Blue Jeans is very solid entry-level stuff. If you have to spend more, I would look at Audioquest. They have cables at all price points, so just find whatever they are selling in the $100 range. I really wouldn’t agonize over this at this point. But I still think Blue Jeans will give you a very solid foundation. 

DH labs silver sonic.  Just above your target but worth it. 

Jerry

+1 for Blue Jeans, it is a great place to start. 

I agree with others re Blue Jeans but would add it might help in determining when to move on, if at all, to having a set of cables with known different sound you can use. I recommend an inexpensive set of Mogami. They are different. When you can actually hear the difference it may be a good time to move on and it might as well point out the direction you should go. Take your time, don't get caught up in the hyperbole about cables. 

I’m already using Blue Jeans LC-1 now, upgraded from KabelDirect. Was just wondering what the next level would be. I’ve heard maybe try Worlds Best Cables Gotham or SignalCable Analog Two or SVS SoundPath.