The Palm V has managed to live quite long in this world of PDAs and is still a great tool. The Visor, as well, is probably an equally valid device. I'd suggest you pick the one you like the best and get started - obsoletion is inevitably and, well, anything already sitting on the shelves at your local retailer is already obsolete by definition.

Normally, I notice that there are "two bells" as far as pricing structures go on computer equipment/peripherals. My "normal" practice is to buy at the top-end of the lower bell, personally (ie. at the top of the price break). Seems to be a good thing to do in a continual cycle of obseletion - at least in my opinion, you get the best value for your money... even though you inevitably will need to upgrade at some point.