Tires: Any better options than Michelin PS2 for my 2006 Boxster S?

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Tires are always a compromise and no tire does everything well. Think about how you plan to use the car next year and use that as a basis to make your tire choice. All tires get pretty lousy at end of life so it's not useful to compare a new tire with one that has been on the car for 2 years.

Here is my 2cents from the cars I have driven. Currently on PS2's:

PS2's- Very good wet or dry, quiet, low rolling resistance (better gas mileage), lousy in snow and ice, very good track tire in street stock class, wear quickly, big$$.

Bridgestone Potensa RE050 Pole Position- nice tire. very similar all around to PS2's, moderate$$.

Bridgestone RE01R- Great s/s track tire, very good wet or dry, useless in snow and ice, a little stiff and noisy around town, wears quickly, moderate$$.

Falken Azenis 615- very good dry, less predictable wet, useless in snow and ice , very good S/S track tire but a little greasy on a hot day, noisy around town, wear quickly, low$$.

Yokohama Advan Neova- Great S/S track tire, great wet or dry, lousy in snow, a little stickier than PS2's but a little noisier also, wear quickly big big $$.

Toyo RA-1- Great spec class track tire (944,986), great dry, good wet, useless in snow, kinda stiff and loud around town, wear quickly, moderate $$.

Those are the ones I know. There are 100's of others. If you are willing to give up a little dry performance there are a handful of all season tires that will work much better in ice and snow and last twice as long. good hunting!