I have a Yashica 124G, a Mamiya C220 and a Mamiya C330. I highly recommend one of the latter. The Yashica is nice, but the lens is average, the viewing screen is dim and it is very noisy. OTOH, the Mamiyas are really nice cameras with interchangeable lenses and close-up capability. If you're really on a budget, go for a C220 and a 80mm. Otherwise go for the C330. You'll soon feel limitated by the Yashica, but certainly not by the Mamiyas. You can find descriptions of all theses cameras on my website:

http://www.lumieresenboite.com