The reason you don't want an R4 is that the official firmware has not been updated for a long, long time. And with them being illegal in Japan, I don't see any updates coming in the near future. You CAN put YSMenu on there, and that works fine, but why would you want to do that when you can get an Acekard2 or CycloDS for the same price or cheaper? Also, official R4s are not SDHC-capable, so you'd be limited to 2GB MicroSDs.
Don't get me wrong, I love my R4. I got a lot of mileage out of it, and it's not a bad option, even now. It's just you can do better for the same price or cheaper. I've been using an AK2 with AKAIO for a while now, and that's definitely the way to roll.