If you just need one for the summer, you may want to consider an unweighted digital piano, like mine (Yamaha YPP-200). They sell for $399 now. So since you said you don't want to spend a lot, and just want to keep playing, this may work. The YPP-200 has 88 keys, midi, etc. I believe it has everything the clavinova has except weighted keys. For that price, it's the best one around, I believe.
-Selsa.