I've been more than happy with my Wacom. Intuos3 A4 - Awesome bit of kit.
I have never regretted spending the £314 out of my redundancy money, I don't think any of the work I have done in the past two years would have been possible without it...
Unless you're buying a second hand one from a total pillock, I really can't see what could have gone wrong with it... all the pens and mice are still available as spares pretty easily - I've had to replace a mouse (pretty poor build quality) but I got that really easily off ebay.
It's scary getting expensive secondhand equipment off ebay, I bought an A3 scanner earlier in the year (reconditioned) again, totally happy with it, I totally understand your reservations though!
If it was me, I think I'd be looking at the Intuos4... I'd love a Cintiq, but that ain't happenin' until I earn some real money!
I doubt any of that helped in the slightest. Good luck with what you decide...