Synomis, if you're wondering about what focal length prime to get, the easiest way of how to decide would be to just put on a zoom lens and test the different focal lengths and see which one you need.

I myself have a 1.6 FOVCF body too and have had the 50mm f/1.8 and now have the 50 mm f/1.4. For me the difference in price between the two is easily justified. I feel the 1.4 has quite better IQ, naturally the out of focus blur is even better and it doesn't feel as plasticky and cheap as the 1.8. I've also found that the 50mm focal range on a crop body works great for me for head&shoulder or 2-3 person group portraits when moving back a bit. I think an 85mm lens might be a bit too long for portraits on a crop body, for me at least.