New SNES and NES systems

I currently have a SNES, but recently I have been playng my friends NES. Now I really want one for myself, so I've been looking at these systems that play SNES and NES games.

How are these?

Would playing NES games with a SNES controller feel weird?

Where can I find NES games for a decent price?

I've been looking at the Retro Duo System, and Yobo Top loade.

I wonder about those myself because my NES is dead.

And the way my SNES is acting it may not be to far behind.

I have an FCTwin somewhere around my house and it worked fine last time I played it. The only problem is that it doesn't work with some games correctly, but I don't own any of those.

Wiki - FcTwin. Has a list of games known not to work with it.

I'm not a fan of the FC Twin.

The Generation NEX is nice though. Plays NES and Famicom games, and you can use your original NES controller.

4-in-1 Atari 2600/NES/Genesis/Super NES combo system
its an unique self made build by a modder which took several years to complete.

dont know if it was sold, but when ...it was definitely not cheap ;)

http://gizmodo.com/379259/super-genintari-4+in+1-console-jams-nintendo-sega-and-atari