I second this.
The CycloDS Evo is hands down THE card to get if price is not a major concern. It has great compatibility, features, and incredible support from their forums. I reccomend you pick up a 4gb A-DATA microSDHC card from Newegg, judging by the number of games you intend to back up, 4gb will easily hold all the games you own, plus have tons of room for media and homebrew.
DSi (Black) + DS Lite (Crimson/Black) + PSP-1000 + Wii w/52'' Samsung LCD HDTV
PC: E6600 @ 2.4GHz + Intel DP965LT + 4.5GB RAM + XFX 8800GT (OC'd) + 1.07TB Total storage + 21inch Widescreen + Microsoft Wireless 6000 desktop