Right behind the AR-15 as my favorite is the FN-FAL. I have a small family of pre-ban AR-15s, and it is now time to work on the FALs. I have my first pre-ban FAL coming this week.
The great thing about FALs is that it is configurable to your tastes (definitely not as much as the AR but more so than other widely available military rifles). Plus, it is a thumper of a round, and has good ergonomics. Finally, mags are cheap, cheap, cheap.
IMHO, quality of DSA is hard to beat. These will run anywhere from $900 - $1300ish, with STGs being on the lower end and the SA models on the higher end. Some like to go even cheaper than $900 - if that is the case, IMBEL seems to be a good choice. Pre-bans are readily available but there is a premium for them. Belgium FALs will be $2-3k, sometimes more. Springfields are usually $1400 - 1800.