I most recently upgraded my handset to a Galaxy SII and I couldn't be happier. It has a large Super AMOLED touch screen, sharp 8MP camera, lightning quick, and makes great use of Android :)
I'm very tempted to get an R4i Gold 3DS card soon, but should I hold off to see if the http://www.r4ids.cn team release an update for the upcoming firmware that's out at the end of November?