if you can, try to see if they sell this particular brand called Skins.
for me, they provide a lot more compression ability than Underarmour/Nike Fit. this is through my personal experience though.
I like Skins coz it keeps my legs warm even in the dead of winter (try running in 2 degree days and you'll appreciate warm legs/leg muscles!), but it also keeps me cool during scorching days in summer (44 degree day = no problem at all). it also has a UV coating, along with compression technology to aid in muscle recovery/DOM recovery.