...The Seiko SBQL001 for example, which has the 8F33 quartz movement is rated to +/- 20 seconds a year...
The 8F33 series are a terrific value on the accuracy/$$$ scale, but you wouldn't know it from their advertising. (Back to my earlier point that this just doesn't seem to be a big selling point).
Looking back at my first post I think I should have said "high accuracy" quartz movements instead of thermo-compensated, since explicit thermo compensation (i.e. some circuit that measure and compensates for temperature changes) is just one way to solve the problem. As Gatsby points out there are other techniques (the 8F33 uses a high frequency oscillator to just avoid the whole problem) to achieve high accuracy without thermo compensation.
If anyone's interested, here's a fascinating article on the subject of quartz watch accuracy and the various methods of dealing with the inaccuracies caused by temperature variations, etc. It also includes a relatively recent list of high accuracy quartz movements:
http://forums.timezone.com/index.php?t=msg&goto=1910741&rid=22062#msg_1910741
Back OT, though: Shortly after my post above I wandered into a local watch store wearing my X33, which I wound up trading in on an Aerospace. The new model has a backlight, louder alarm, and the SuperQuartz movement I've missed since swapping the B1 for the X33 a few years ago. I'm normally immune to trade in offers at watch shops since the prices are pretty poor, but apparently the X33 is no longer available to the general public (just NASA and the military), and the dealer had a customer who'd been bugging him to find one, so they made me a pretty good deal.
I'm really happy with the switch so far. It's slightly thicker than the old Aero, but now has a case back secured by screws rather than the old snap-in design and a much sturdier bracelet/clasp. I'm not nuts about the "minute repeater" clogging up the "crown press" operation mode since I never use that, but it's still pretty easy to operate.
Regards,
Bob