I would get a micro, I have one and a DS. Love the micro, the screen makes every game look sooo much sharper, due to the same pixel resolution as the GBA SP, just better dot pitch. Micro plus a M3 adapter, almost perfect!
@ veho, I got a micro for Christmas last year, and the price at both the PX (Postal Exchange on Military Installations) and Wal-Mart was only $50 for the special Famicon edition. Granted, the Famicon edition comes with no extra faceplates, it is well worth the money.