The spec coilover for spec boxsters is still the PSS9 I believe. Take that for what it's worth...
I have the PSS10 currently, but haven't had a chance to get them on track yet this year. I almost went with the Ohlins, but my takeaway from local racers was that for twice the price, you don't quite get twice the coil. They're a bit better for sure, but not 1400$ better. FWIW on full soft, the Pss10 are stiff on the street, but don't punish you like the MSS springs and 034 springs (I wanted to keep DCC like a fool at one time). On full hard I drove over a train track and felt as if someone ripped a disc out of my spine.
It also comes down to how well you know how to setup your car. While most people can mess with a single adjustable to tune rotation just fine, stepping up to a 2 way starts to get more complicated and a 3 way is outside the scope of the majority of people who track their cars. Let's not talk about 4,5-way setups, bump stop tuning, etc. I would say start with what kind of tire you'd like to run, and build around that. If you plan to go to a slick ever, you need at least -3.0 camber front, and preferably -3.5-4.5. If you're running a slick, you'll also want to be running springs in the 650#+ range. That kind of setup on a 200TW street tire will just tear up the tire.
AST, Moton, MCS, Ohlins, Bilstein were my considerations. AST/Moton wouldn't give me any data or information on their dampeners, except for "Our dampers are really powerful so you can run soft springs". MCS I could only get from ground control it seems and ground control's level of communications was so poor (we're talking weeks of lag and following up to get responses), and considering how often those need rebuilt I decided that kind of service wasn't worth it. My friend waited for 12 weeks for a rebuild on a single MCS strut for his M3... Ohlins communication, detail, and quality all seem top notch and I would have pulled the trigger on them, except I had quite a few other things that happened all at once (popped a rim, changing jobs, new baby, blah blah blah life) and I just couldn't justify 2800$ vs 1300$ when I also needed a new fire suit and a couple rims
.