Yes, castlevania 2 & 3 would be great. I wish they would release Super Metroid as well, and why not do a remake of Metroid 2?
I wish they would at least incorporate a quick save feature on these classic releases. Metroid did something like this with it's save password feature, but i wish i could play through the original Castlevania in several sittings, not always one.
How about some love for Rygar? I would kill to have that classic portable. Man, the possibilities are endless. Im waiting for most of these to go down in price before I pick them up. I mean i would love to have the original Mario handheld, but its ridiculous to pay $20 for it, considering I could get it multiple times over at that price for the original NES cart, and that had duck hunt included!
But the one port that would really rock my world would be a classic release of Pirates! from the old NES days. Not as good looking as the new release for PC, but almost the same gameplay, and it already has a quicksave incorporated!