If you want as close to a C7A1 as you can get buy a 20" flat top with a removable carry handle. Walter at Arms East has them for $1575 IIRC.
My advice is to skip the free float, match this match that upgrades and just shoot it. Then bring your iron sighted rifle down to Chilliwack for the end of May and shoot the BCRA Service Rifle championships, there you will be able to talk to people who shoot the rifles (and have shot them for decades) and look at the optics in use before buying a scope. Then when you can out shoot your rifle (prone, sitting, kneeling and standing) start upgrading towards space gun land.
Remember, this is just my opinion.