Currently trying to make the same decision for my MkV GTI. Northfield car sound in Moorooka recommended a Zenec unit which a few others here have also posted about, but no-one seems to have recent experiences with.
The other option I am considering is an RCD510, because the RNS510's Nav functionality really is pretty dismal from what I can tell, and I'm not particularly after a GPS anyway - my little stick on the windscreen Garmin would work better.
Personally I'm a little suspicious of the source behind those eBay RNS510 units, and that is giving me pause before ordering one.
Let us know how you go !
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