@rad140 - The M3Real Perfect Bundle seems best for NDS + GBA Gameplay. Mainly, since there is a built in loader for GBA Games in the O/S for the M3Real. Also, you can use cheats as well which may serve to be useful at the harder parts [if you are too lazy to do it the long, harder way]. I don't recommend waiting for the SuperCard DSTWO. Like I've said to others, the ETA could be anytime. Today, Tomorrow, Next Week, Next Month, heck, it could even be Next Year.
According to your flag, you are from Canada... And lucky for you, KickGaming has a sale for the M3Real Perfect Bundle:
http://www.kickgaming.com/real-simply-real...ndle-p-277.html
$5 may not be a huge discount, but it is enough to make it fit in your price range.
@dapath - Slot 1 = the Top Slot for DS Games. Slot 2 = the Bottom Slot for GBA Games + Expansions. Seems to me that you are searching for a flashcart with good compatibility. For that, I will recommend the AceKard 2i for Price and for Game Compatibility. Just pair it up with the akAIO firmware and it is one of the top flashcarts for you money.
You aren't interested in GBA Games right? If you are, then consider the M3Real Perfect Bundle.
Oh and I forgot to mention this, if you are getting a DSi/DSi XL, then you are not going to be using Slot 2. Loading GBA Games will be harder, and the only flashcart that is capable of loading both GBA and NDS games without an expansion is not existent. The SuperCard DSTWO is rumored to be able to load both NDS and GBA games since it has a similar hardware build to the iPlayer [which is capable of loading GBA Games threw an emulator]. Just, think about it first. Will you be playing GBA Games if you got a DSi / DSi XL? If yes, then wait and find out results about the SuperCard DSTWO and if no, then go ahead, buy the AceKard 2i.