That really depends on you budget. Don't worry about me I have my fix. Fortunately only $1500. With a long list of repairs before I even get to drive it but that's the way I like it...
My opinion is that I would bid on the stroker on ebay. Your were already thinking of paying 16 or 17 for the other car so why not take a chance and bid on the stroker car. I don't think it will get up to 16 or even 17 grand for the car. If you do not get it do some more shopping and be patient.
A 306 is a .030 overbore 302 with stock 3.00" stroke, a 347 has the .030 overbore AND a 3.40" crankshaft.