What is the latest and fastest handheld palmtop Jornada?

I thought the higher the number the better (ie. 728 is better than the 720 is better than the 690 etc). But the 820 is slower and bigger than the 728 etc. What is the latest and greatest Jornada (in the clamshell with keyboard variety, not the PDA variety)? Thanks.

728.

actually the jornada 820 was the FIRST jornada hpc. (if i'm not mistaken?!)

The 728 was the last and fastest of the Jornada series of HPCs. The 728 is pretty much the same as the 720, but with twice as much ram and a slightly updated version of the HPC 2000 OS. 728's did not make it to market in nearly as great numbers as the 720's, as the whole line was canceled after the release of the 728. Thus, 728's typically sell for $400+ on eBay. A great way to get a 728 is to buy a 720, which can be had for $135 via Techsmartz on eBay and upgrade it to a 728 using my Jornda 728 ram/rom upgrade boards:

http://www.hpcfactor.com/forums/forums/thread-view.asp?tid=3018&start=1

IIRC , some firm was offering RAM upgrades for 720s. I think you could go to 128mb.
IMO, they were too expensive for my tastes.