Wait, 8 bit GBA? Isn't the GBA a 16 bit system?
Technically the GBA was a 32-bit system. It has a 32-bit RISC processor. If you're interested in reading about the inner workings of the GBA, I suggest reading this. It really was quite the capable system for its time and it had a thriving homebrew scene back in the day. You can even emulate NES and Gameboy (Color) games on a GBA. Hell, there's even highly limited SNES emulation! Pretty impressive stuff, really.
Btw, I'm pretty sure Smokey was referring to "8BitEvolution" when he said 8-bit.
Anyways, I have an AGS-101 (backlit GBA SP) that I use to play most of my Gameboy and GBA games on. It would be pretty nice to have it in the form factor of the original GBA, but I'm too lazy to take it apart myself, nor do I have the money to buy one pre-made. I also like to play my GBA games on a GBA Micro, but I get handcramps from using it for a long time. Actually, let me list all my GBA systems:
Original GBA (replaced the shell with a Midnight Blue one, because the original shell melted... Yeah... Don't ask, lol)
GBA SP Classic NES (limited edition)
GBA SP Kyogre Blue (limited edition)
GBA SP 'Chinese Dragon' (it used to be a normal black GBA SP, but I replaced the shell myself because the old shell wat totally beat up)
GBA SP (AGS-101) Onyx Black (my personal favorite)
GBA Micro Silver
GBA Micro Blue
I love the GBA! :D Maybe I'll edit this post later with a picture of my GBA's, lol.