I'm also pretty happy with the way my Vypers came out. They're mottled in grays (fortress gray, space wolf gray, and skull white, actually) to match the same basic thing my Eldar have going on. Same goes for the gold canopies. I got both of these in a trade; one was fully magnetized and one was in the box. When I say 'fully magnetized', I mean the thing could be taken fully apart, the guns were magnetized, etc. I tweaked that one a bit, and instead of popping the whole front canopy assembly off, I just moved a magnet to the chin turret, and kept the gunner's turret magnetized as it was.
I think the two configs I'd run Vypers in are double shuriken cannon (Seen here) and catapult/scatter laser. Even if I don't end up changing loadouts often, I can still track damage readily.