I am 6'6 - 190lb. I have 27" Schwinn continental. It has 27" tires. Seems to be the right size for me with the seat and the bars raised. I haven't been on a bike in 30 years, never in my adulthood, so I have no reference point... im a total newbie.

The thing is, if I spring for another bike, another vintage bike would be what I purchase since I probably cant afford anything of quality new (less than 300 buck range).

I am not sure how to refine my craigslist searching for the proper size? I don't know what I am after in regards to size. Any tips?