Why is the seller selling? How old are the tires (not wear, sidewall ages)? Do you have another car or room in the budget for snow tires and rims? Storage room for same? Any service records available? Frequency of oil changes? Where in Md? Will the owner allow a PPI that you pay for? How will this stretch your budget? This is a > 15 year old car and parts age as well as wear out. Buying one isn't like getting a 2 year old car with 35k miles on it.
Owned 2, loved 'em both. Mine were very reliable. Roll them dice.
More on buying a Boxster here.