Should I get the APAD IMX515 or the Zenithink ZT-180? WIFI strength is important to me... But I really want more RAM than 256. How "fast" is the Zenithink compared to the APAD? I'd get the Zenithink, but it only has 256MB RAM and 2400mAH Battery Pack... How stable are the 2.2 custom firmware(s) for the Zenithink? The price for them both are about the same... I plan on buying @ MeriMobile.