What did KBB say about the value when you ran
the particulars thru it for value?
Well, you did select smartly when you chose a manual because this is one of the potential weak and expensive unknowns when you purchase a used e46 with auto of this vintage.
Car looks like it has been detailed in and out, but beyond that you should pursue the service records, the dealer list of work, and a mechanic's evaluation.
Perhaps look to see if car has stock springs and shocks to see if aggressive driving could have been on the mind of the owner. Inspect rear shock towers to be sure. Got a sunroof? Any sign of leaks or rough operation?
Spend some tiem reading this board back into time to get a feel for this breed, and some of the problem areas. Water pump been replaced yet? Control arm bushings in good shape? You're just getting started!