YB - I hear ya about being broke too. In 6.5's the only thing I have heard of fitting was the Infinity 6000cs($120) or probably the new 6010cs ($220) and some Pheonix Gold.
There are other speakers, but they are too deep. I've tried doing some searching and it seems that Infinitys really are the best option for a low budget and with our car.
Cardomain Infinity 6000cs
Those are the 6000cs for about $120 shipped.
Let me know what you go with, because it looks like we will be taking a very similar path with our speakers...