I just bought the Bilstein Heavy Duty struts that are factory replacement for my 97 2.5 and they're great. No adjustment opportunity though.
If I were to do it over again, I'd go with coilovers of some sort that were adjustable. They're double the price of factory replacement parts, but the labor to install them is the same. It's a great time to upgrade.
However, one must do all four instead of just the fronts or backs.
I am assuming you mean strut braces. I bought front and rear from Schnell. You can get both front and rear on Ebay for less than $220. They are of average quality but they seem to be doing the job. Installation was not difficult.
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2000 Black Boxster S
EVO Intake & GIAC Tuning
Headers & Porsche Sport Exhaust System
ROW M030 Suspension
Front & Rear Strut Braces
B&M Short Shift & EVO Billet Linkage