Overview on Java and PDAs

Hi folks,
for a study research project i need to find a good solution for the following simple thing:
i need to develop a java based gui application to run on a pda - possibly a high end device with all the features :-) ..
a year ago we were just running familiar linux on an iPAQ and the arm vm from from sun - which resulted in a very slow program flow... i guess for now that there are (1) much faster pdas and (2) so much better and faster jvm solutions.
where can i get a good overview of the possibilities? which solutions do you all prefer? which operating system to use?
so now where to spend my money on? only a good pda and possibly free software to develope? do i need to invest on software, or are there - good(!) - free ide's?

I think a custom built Hardware based on pxa255 Arm core processor with Linux
on it will be a good solution.
You can put KVM+MIDP or even JVM+JRE can be put on this linux and then you can build your GUI based applications !

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