you should not even be considering the cyclods or the cyclods ievo. they are a dead team, there haven't been updates for close to 2 years. the laste firmware had a lot of homebrew compatibility issues.
r4i gold (.cn) will get you gaming using a wonderful kernel (wood) which has great rom and homebrew compatibility, and all for around $14. the scds2 will offer exclusive emulation (gba, snes, mame4all, atari, and a lot more if you tinker with the linux install), slow-motion, fuzzy cheat finder, real time save, and more, but for around $40.
we really do not recommend much else because nothing else is supported on an updated dsi/3ds. however, if you have an older system then i would highly recommend the acekard 2.1. it runs on the ds phat/lite, does not have the ccontact issues of the ak2i, and utilizes the akaio kernel. i spent a long time beta testing for akaio and made sure it supported more homebrew than any other kit. so if homebrew is your thing (and emulation) then check out an ak2.1 or 2i.
-another world