Fabrique Nationale probably makes the best ones, but that'll set you back 3 to 5 thousand dollars.
DSA makes a very good rifle, but will cost you at least double what you paid for the Century.
There were many "demilitarized" rifles imported over the years, and this is what most of the FALs were built from. These rifles had their receivers destroyed by torch cutting them into three pieces before importation. You could then assemble the parts on an aftermarket receiver from DSA or
Imbel and have yourself a real warhorse on the cheap. The days of cheap kits (and cheap surplus ammo!

) are over, but you can still find decent deals on kit guns assembled by reputable gunsmiths.
Have you shot your FAL yet? It might be okay; some Centuries are just fine. If you are still looking to "upgrade" you might want to scan the Marketplace section of falfiles, or keep an eye on
gunbroker.com auctions.
As was mentioned before, it's the ammo that's going to be the big concern. You're looking at $.50 a round for 30 year old 7.62 milsurp, and even more for new commercial .308
You might want to function check your rifle and if it works okay, put any extra cash into ammo. The time is now, and it ain't getting cheaper!