I suppose it depends on how you intend to ride: soft rubber and possibly a bit narrower in the rear for fast turns.
Me... I chose one that I've liked on the last three bikes I've owned: Michelin Pilot Road, which is now up to version 4, but I have PR 3's. I find they grip well enough for any g-force I throw at them, do well in the rain (the sipes seem to really work and not just make the marketing guys happy), and at 16K miles they've already outlasted the original tires and have at least half their tread left. Despite the harder compound in the center, the rear tire (at 9K miles) is starting to flatten out, but then I mostly commute on them with 2/3 of the miles on the freeway in relatively straight lines.
(Digression: there was a guy on the the BMW forum I used to frequent that would reshape his aging rear tires with a belt sander. I've never bothered, though I can tell the difference in feeling as the tire rolls off those shoulders and on the the still-rounded sides, but it's easy to get used to and makes the new tires feel really really good!)
I know the experts say to change tires to the same brand and model and both at the same time. I've never listened to them. Maybe the eBoz can tell a difference, but I haven't been able to. I've read the arguments about different profiles having different handling characteristics which can be at odds with each other, but my butt remains blissfully ignorant as I mix and match and just run 'em to the wear bars. But then I used to run my old car tires until they were canvas!
I pretty much change out the front tire at the same time as every other rear tire.
Next change, I plan to install aftermarket 45-degree tire valves so I can actually get my pump head on and off without leaving a black stripe from the brake rotor on the back of my hand.
Let us know what you pick and how you like them.
