What is the most powerful Pocket PC successor on the market that use mobile technolog

[aximblaster]

I love pocket Pc's and already purchase many great applications. I wouldn't like to switch to a blackberry, s60 type of OS but I need something more powerful and richer in new gadgets.A powerful, actual PDA.

It could be a Phone-PDa also.What is the best and really worth to buy and I can still use my old Mobile 2003 or even 2002 applications in a backward compatible way.

Axim X5 was my first and then I went to X30 but am still dragging behind. I need something that I would not be worried to find the batteries or any accessory in the future.Something with enough memory and expansion that I would not miss my Desktop PC or laptop.
I like to have my GPS, wify in a same device.