I have heard good things about Del Axim Pda's, X51 or larger. I bought my son a used one locally. It seemed to be like new
. This thing was always going dead or completely losing his data. He had two batteries for it as well. It finally quit completely.
I think he just had bad luck or was not charging it properly. I know other people that have these and love them.
I opted for the Recon and it is awesome. I have left it unplugged for 2-3 weeks and it is still good to go. Downside is that it is exspensive.