Would be very interested to hear about any more experiences with the Continental ContiRoadAttack 3, also heard they were very good and will probably try them next.
A bit pricey currently though, around £30-40 more for a set than other options.
So far I've used the MT60's, Metzler Z8 Interacts & Bridgestone T30.
Pretty much all that's available for the 18" wheel are sport-touring tyres.
Hard to compare as the Metzlers were on a pretty standard bike and the Bridgestones on one with Ohlins rear shock and narrower bars.
The front end feel from the Bridgestones feels nicer though, seems to be much more confidence inspiring.
Looked newly fitted when I bought the bike and 1500 miles later are wearing well. Don't appear too prone to squaring off after more motorway miles than I'd like. Not night an day compared to the Metzler Z8's, unlike going from MT60 > Z8's, which was a huge improvement.
The MT60's are good and seem to be a great all rounder but they must be very heavy or extra stiff or something. They make the ride much harsher and slow the steering down quite a lot. Tyres are always a compromise I suppose. MT60's look the part though!