Intermanaut, I think the OP would search for the answer first if he could. Hence his question.
Search is crap. You'll get forum posts mixed with threads mixed with editorials etc. You'll also get threads that are several years old. It really is a pants search feature that needs to be fixed. Type in your subject then you can filter.
As for GPS watches, there are plenty to choose from.
Garmin Forerunner 610 and Suunto Ambit 2 & Timex ironman are the front runners. All come with HRM and you can upload your training data to PC or online.
if you are buying for a specific event then buy those most suited to the terrain. Don't really know a great deal about the shoes you mention but i know that Walshes are favoured by those who run the more serious trails whereas Salomons have a reputation as being more of a hybrid shoe.