I think more important really is what you are going to put in the guidescope rather than what the guidescope is - as has been noted. Most any ST80 will guide, add a barlow if you must but the sub-pixel thing is a misnomer unless your imaging camera has a big chip/little pixels. You need to think anout the system as a whole rather than the individual parts H0ughy.
Personally... I'd go with a WO or one of the clones of these scopes - that way you get a decent build, decent optics, eye candy, and grab and go as well
Having said that, the ED80 genre are very nice, mid-FL range scopes that again, are good grab and go as well.
Arthur