I'd say if you are looking for around 10K then go for a 968. I've seen some really good ones for sale lately(if your in the east coast). Say a 70K 1994 968 for around $13.
http://www.autotrader.com/fyc/vdp.jsp?car_id=190405461&dealer_id=57006249&car_year=1994&search_type=both&make=POR&transmission=Manual&distance=0&model=968&address=46825&make2=sel_one&certified=&advanced=y&max_mileage=&max_price=13000&bkms=1131076236775&min_price=1&end_year=2006&color=&start_year=1987&drive=&isp=y&engine=&doors=&fuel=&lang=en&cardist=622
If you are going to spend 10 on a 944, your better off with a 968. its newer, has a 6 speed, and has simular hp and speed as a 986.
But if you are in the 5-10K range I would suggest a 944s2 or 944N/A, stay away from the turbos. They like to drink $$$$$$$$$$.
edit: a good 964 will still run you close to boxster money