I had a Forerunner 10 for just over a year and I thought it was brilliant. Simple to use, reliable and accurate. I've just got a Forerunner 310XT and it is even better - even though it's got many more features I'm actually finding it simpler to use! I got it off amazon (with the heart rate monitor) for £124. The Forerunner 10 is on for about £80. If you can afford it, the extra 40 off quid is definitely worth it.
I've been using a Garmin Forerunner 10 for about 18 months and have just upgraded to Forerunner 310XT with heart rate monitor (about £120 on Amazon). Absolutely brilliant. The forerunner 10 was great for simplicity but did have a short battery life - the most I got was 6 hours - charging in the car right up to the start. For longer ultras I'd switch to strava on my phone at about 5 1/2 hours which was not ideal hence the switch to 310. I reckon I'll be running for more than 20 hours once or twice a year which I didn't think was enough to justify the price tag on a Fenix or Suunto Ambit.
The great thing I've noticed with the 310 is that it is really easy to change settings on the watch. This means that I already find it easier to use than the Forerunner 10 even though it has loads more features. It also locates satellites much, much faster.
For what it's worth I had a Forerunner 405 when they came out and found it a real pain to use, mainly because of having to use the bezel to change settings. I also found that my cuff used to stop/change it in mid-run. I do believe that Garmin have improved this on the 410 though.
Finally, Amazon have Forerunner 10s for £80 and 310XT HR for £124. I would say that the extra £44 is well, well worth it.
Alternatively, I find size XL Craft tights normally fit me fairly well (6'3" and 32" waist). I'm lucky enough to work near one of the UK suppliers (Ultrasport) and can try them on. I'd avoid anything with stirrups as although they stop them riding up I find they also pull them down!
As Cougie says though it's rare to wear tights - usually only when it's high hills and appalling weather or when running through deep hard crusted snow to avoid getting lacerations around the calves!