Time for an upgrade

I bought a Handspring Treo 300 smartphone on Ebay about a year ago and quickly became a smartphone devotee.
I congratulated myself for getting in so cheaply - about $70, I think - by buying what amounted to a two-year-old (obsolete) model.
Now, after a year's good service, the old Treo 300 isn't holding a charge very well and I decided it was time to retire it in favor of the next model up - still one model behind the cutting edge and soon to be two back from the front.
The Treo 600 was the top of the Handspring food chain when I came aboard in August 2004. It was supplanted a few months later by the Treo 650. Now there's word of a forthcoming Treo 670 and beyond that, the Treo 700.
Whatever.
The 300 was a better PDA than it was a phone and I was in constant fear that the flip-up clamshell cover, which held the phone's earpiece, would break a hinge. They're notorious for that and I figured it was just a matter of time before it happened. But it turned out that the battery was the real Achilles heel for me.
The last straw was a couple of weeks ago when the battery crapped out on me in Woodland Park, Colo. as I talked with my dentist at home. I discovered a crown adrift in my mouth while eating at a Mexican restaurant and phoned Dr. Stegemiller for advice. Fortunately, one of my riding companions was able to hook me up with a dentist in Fairplay, Colo., who had it glued back in place within two hours of the dental failure.
But it soured me on the 300. When I got home, I installed a replacement battery, but it didn't work right and I started looking on Ebay for a good deal on a 600. I found one and snagged it for less than $200. It arrived today and, while it's not the top of the line, it's light years ahead of the 300.
It has a camera, more memory, accepts SD memory cards and I can attach a folding fullsize keyboard to it for more efficient blogging on the road.
I figure I can enjoy the fruits of techology quite cheaply if I'm content to have last year's model.