The Century guns are hit and miss. (both the L1A1 and the STG58) Centurys quality control leaves something to be desired so while some of their rifles are ok, others are a real mess.
Some of the problems associated with their rifles are out of time barrels, improperly fitted parts, poor quality furniture, horrible 2 piece gas piston.
If you decide to try a Century insist on getting one built with an IMBEL receiver. These receivers are made by IMBEL in Brazil. IMBEL is the only FN licensed FAL manufacturer still making rifles today and they are quality, milspec units. The other receivers that Century uses are Hesse. These are reverse engineered and usually out of spec. They can be made to work properly but most of the high end FAL smiths refuse to work on them. (AZEX is an exception)
I owned an L1A1 sporter many years ago and it worked fine. With Century, it's a crap shoot.
I currently own an IAI M444. This is essentially an IMBEL rifle that has been assembled by IAI in TX with enough US parts to make it legal with a pistol grip stock. The barrel and gas tube are chrome lined. The handguards on mine were a bit scratched up but are perfectly servicable. The rest of the furniture is like new. Older M444 rifles had Hesse muzzle brakes permanantly installed. They do a fine job of controlling the muzzle but amplify felt recoil by pushing the stock into your cheekbone. The brake has 2 rows of 3 ports at 1100 and 0100. I corrected this problem on mine by opening up the original ports a bit and drilling 4 more ports, 2 at 0300 and 2 at 0900. The trigger on my rifle needs work. It has too much creep and is way too heavy. FALs are not known for their match triggers but can be made to be pretty decent with a bit of work. Mine is correctly put together and functions flawlessly. It came with a fresh, gray parkerized finish. It shoots about 2moa with surplus ball and about 1-1.5 moa with match ammo if I do my part. The M444 is not perfect right out of the box (trigger and muzzle brake) but it is a solid, well made milspec service rifle. New M444s are said to have a new muzzle brake that fixes the recoil problem. I highly recommend this rifle. I see them listed in Shotgun News for under $700. A bit more that than the Century guns but well worth it in my opinion.
DSA makes new rifles (SA58) and "kit" guns (STG58). Their SA58 is all US made and has an excellant reputation. The STG58 is made using their receiver and and STG58 parts kit. I have not handled one but they are reputed to be excellant. DSA is a first rate company. The SA58s are well over $1000. The STG58 is right around $1000.
I hear mixed reviews about Entreprise rifles and have no experience with them. Some love them, some don't.
Olympic is advertising a new FAL varient (T43 2000 or something like that). I haven't seen one but Gunplummer (Arizona Response Systems) does not have anything good to say about them.
Any FAL built by one of the FAL smiths will be of excellant quality and expensive. Arizona Expert Arms, Arizona Response Systems, Double G Gunsmithing, to name a few.
For a good, solid rifle that you can build on as you go I'd recommend the M444.
You can always buy a kit and a receiver and build it yourself.