Need your advice!

[Perfectlap]

yeah those used Boxster prices vary widely.
I had a 1994 Miata as well. LOTS of mods sold it for $7,000 with 110,000 miles.
The Boxster is the only car I would have given up the Miata for. I debated giving up the miata for an S2000 for several years but never took the bait. Once I saw the Boxster up close at an autocross I didn't think it over much longer. A "best pure sports car in the world" episode on Top Gear tipped the Boxster as the best.
About a week later I bought my S.
Seeing Tiff slide the car around while laughing was all I needed to see that the Boxster was natural progression for a roadster die hard.

I frequently checked Ebay to see where the Buy it now prices were for a particular year and mileage. They were often below the private seller blue book value yet the cars still didn't sell. More of "real world" barometer me thinks.
I also watched the bids and the prices bidders seemed willing to pay.
A good deal on Ebay doesn't last too long.

p.s.
I see your in Virgina. Porsche sells allot of lease returns at auction in Manheim,PA.
Too many for the dealerships to take on for used car sale. Make a friend with a bidder who has a dealer auction license and you could save thousands.