i had the rx5915 and it has good and bad points. love tt6 and having built in gps. didn't like qvga. my rx had a few quirks. if you read reviews on it you'll see that lots of people didn't feel it is a polished device. i liked but didn't love it. $200 is a good deal.
I've got the 5935 - yes a couple of quirks but packed with features - WiFi, BT & GPS + 2Gb Filestore... :)
Shame the processor is only 400MHz... so is probably not as powerful as the AXIM. Also only has SD card slot, and from what I've seen to date, it does not accept SDHC cards...
Personally I think $200 IS good value. (I paid closer to double that...)