Tempting but... The screen. It's so small.
I think I'll stick to my GBA SP II.
Backlit Version
In North America in September 2005, around the time of the Game Boy Micro's release, Nintendo released an improved version of the Game Boy Advance SP featuring a backlight instead of the previous version's frontlight. The brightness can be set to low or high. The box says, "Now with a BRIGHTER backlit screen!" to distinguish the new model from the older, frontlit models. Although it was never officially differentiated from the original SP by a different name, is has been unofficially titled the 'SP Lite' (dubbed so because of the release of the DS Lite) or the 'SP2', or 'SP Mark II' (as it is a second SP). The standard editon currently comes in three colors, Pearl Blue, Graphite, and Pearl Pink; Also available are the SpongeBob SquarePants edition, as well as a red SP with Charizard engraved on the front and a matching green SP with Venusaur engraved on the front (for Pokémon FireRed and LeafGreen, respectively).
- From Wikipedia