iPlayer is not worth it, it actually cost ~$1 more than SCDSTwo on Price Angels when I looked earlier this morning to compare prices on the DSTwo. I didn't even see iPlayer on Shoptemp. The GBA emulator for iPlayer got no further support after its initial release. The one for the DSTwo is the only one that has had any further improvements since release.
It also does not play commercial NDS roms, and I was aware of that when I bought mine. GBA emulation was the reason I bought it, since at the time I got the iPlayer it was the only way to play any GBA roms on a DSi/DSi XL.
edit:
Also, I really look forward to getting a DS Lite again, with a 3-in-1 and some other stuff. I also ordered a DSTwo because I've been dying to see it for myself but I refused to pay full price until all its advertised features were finally supported. (Partly due to extreme disappointment with iPlayer as such an expensive flashcart that had so little on the plate in terms of homebrew using the additional hardware.)
edit2: that's extremely weird. one of the places in my post where it says shoptemp, i'm sure i said the name of a different website. trying to fix it. fixed