Best GBA flash cart to run a NES Emulator?

[maxmouse2008]

OK this is a combo of questions here,

I saw a GBA Micro (the famicon edition) on craigslist for $30, first off is that a good deal, and anything I should look out for in buying one?

2. I plan on getting a flash cart to mostly run NES roms. I think it would be really cool to have a portable NES in my pocket, so what is the best emulator to use, I've seen pocketnes so how is that? Is that one of the better ones?

3. What is the best flash cart to get and where to get it from? (I'm stateside)

thanks!

Also I wasnt 100% sure where to put this