Me is a 2.8" screen with same resolution as Y & with less ram @ 256Mb. Y uses Broadcomm processor with their own GPU whereas Me uses Qualcomm MSM7227 proccy with Adreno 200 GPU but with less ram & small screen, just avoid it. if you want to buy decide between 3: Galaxy Y, Optimus One/Net & Dell XC35.
Explorer is a good deal but with 1 major problem. its internal memory (FREE) memory is ~50Mb or less. even if you transfer apps to external memory in a day or 2 you'll get low memory warning. get Explorer if OP is ready to decrapify it so that around 50Mb more disk space frees up. remember Explorer uses Cortex A5 based processor like that. much better than the MSM7227 chip & Broadcomm proccy found in Y.