Hertz van Rental said:
Well the Yashicamat was a copy of the old Rolleicord...
Sure, and the Rolleicords go for cheaper than the Rolleiflexes. Other inexpensive TLRs that have great reputations are the Mamiya TLRs (interchangable lenses), and the Minolta Autocord (which has a cult following). Ricoh (Ricohflex) and Zeiss (Ikontaflex) also make TLRs that I've heard good things about.
When looking at old camera lenses here's a list of some lens names/designs you're likely to run into.
lower end: anastigmat, apotar, agnar, novar, yashikor, yashimar
in the middle: tessar, xenar, solinar, skopar, yashinon
upper end: planar, xenotar, heliar, APO-lanthar, mamiya TLR lenses
Of course it's possible to run across a lens that doesn't perform as well as it should, and sometimes you find a lens that does a lot better than you expect.