The most important thing than is to have a filter that is high-quality multicoated on the front and the back!!!
The place where I buy my gear carries two different 72mm Hama UV filters. The one that is "HTMC" (High Transmission Multi Coating) is only EUR 2 more expensive than the "regular" one.
Anyway, it's supposed to have 4 layers on each side, so I'm tempted to buy it, just for the ease of mind of knowing the front lens will be protected from scratches / grease marks.
Would anyone with good / bad experiences with Hama UV filters please share them?