Cool, the PST is a great scope for its price. But as HK Dave said, the SS 5-20x50 would be a solid improvement in resolution, and is considered an awesome bang-for-the-buck for about $400 more than the new cost of the PST. The SS competes well with the Razor and Nightforce NXS. An IOR would be another to look at for a huge step up in resolution from the PST, and is probably the best glass under $2k.
IOR 6-24x56 Tactical 35mm Rifle Scope
The Sightron SIII's are all really amazing for around $900-$1000 and the SFP
Sightron 8-32x56 SIII 30mm Riflescope would be an improvement in resolution and also give higher magnification ability, but you will always be mirage-limited above 24x. There are also the new SIII FFP 6-24x50s out now too.
Bottom line, if you can afford the 2k price point; Razor, IOR, Nightforce. If $1300-$1500, the SS can't be beat. There may be some great deals on Razor coming up, as the new ones were recently announced.