What you probably need to do is figure out which FAL you like the best and build one of that style. I have an Imbel, a G-1, and several STG's. Those are all "metric" FAL's. My personal favorite is the STG-58.
The are also "Inch" FAL's. L1A1's, Australian, and Canadian. If you want to build an inch rifle you have your choice of L1A1 and Aussie kits.
And then you have the Israeli (Izzy) kits. They are similar to metric rifles but have some differences like barrel threads, different gas tubes and gas plugs. The sights are taller than metric FAL's also. There are some nice Izzy heavy barrel kits out there now but they are pricey.
If you go metric the best bang for the buck is going to be an Imbel kit on an Imbel receiver. You can get Imbel receivers for $199 from FAC and good kits from Dan's. Dan's has 3 grades of kits. I mention Dan's because he seems to have the highest customer satisfaction.
G-1's are nice. They're basically an STG with a regular long threaded gas tube and wood buttstock and pistol grip(most STG's have plastic buttstocks and pistol grips but some have wood buttstocks). The problem with many of the G-1 kits is that they are WORN OUT. It's hard to find a kit with a non-pitted barrel and most of them have gas block threads that are too loose to reliably hold the gas tube. If you want a good G-1 kit go to DSA.
The STG kits from FAC and DSA are REALLY NICE. Many of them are in new or arsenal reworked condition. They cost more, but you get what you pay for.
Tools you need are headspace gauges (1.632" or 1.634", your choice), a good receiver wrench, and "preferably" a barrel vise. You "can" get by with using a wrench on the barrel flats to torque the barrel down. I built my first one this way. There's a lot you need to know to build one of these things and I would recommend checking out Falfiles.com for more information, unless you want us to guide you through it.
I would stick with DSA, Imbel, and Coonan receivers. It would be best to forget Hesse and Entre'prise unless you have lots of hair you want to pull out.
No matter what you build, the rifle can have no more than 10 imported parts. That means you have to replace 7 parts (from a BATF list) of the rifle with U.S. parts. If you don't use a muzzle device, 6 parts.
Example: One of my STG's has a U.S. receiver, buttstock, pistol grip, muzzle brake, and H/T/S (hammer, rigger, sear).
My G-1, which has no muzzle device, has a U.S. receiver, buttstock. pistol grip, and H/T/S.