I went TruBor while some other guys I know went custom "Bedell".
Theirs are great guns but none of them or me can shoot to the ability of the gun, i.e. custom
I shoot high B class field course scores at my local club and ranked the same with it.
I've been allowed to shoot some of the masters guns and at my skill level I don't do any better with the custom guns, but they sure are nice and as should be slicker!!!!
Starting out a used gun from a local club member may be a good choice or a TruBor to get your feet wet and as said before would make a great back up gun when you take the plunge to custom.
With your budget you might contact Dan Bedell and get a price from him on a custom, by the time its done you'll have figured out open with a used TruBor and still be under budget. Think Bedell's guns are about 4k but call him.
He is well respected and is currently the guy build Max Michelles guns
Good fortune in open
jcc7x7