195/50/15 is a very, very popular tyre size and is usually the chapest size for "performance" tyres.  
I currently have Yoko A539s.  I dont rate them that much in the wet; in fact Ive had a few hairy moments, but Im still not sure if thats due to oil/high-power FWD/snap-tastic on limit handling.  
I always hear good things about Goodyear Eagle and Toyo Proxes.  In this tyre size, they should be under £50 a corner if you look hard.  Thats £200 a set, which is far better than for my old tyre size: 205/45/16.