What sort of competition are you looking to do Steve? They may help in getting some ideas on what may work for you.
I think the best thing though is to attend some matches1st & talk with those there & see what they're using.
There are some decent factory rifles out there that with some mods can shoot really well.
Another route would be to find a used custom gun. There are several sources for these.
And then a new custom, which may or may not be any better than any of the above.
If you could shoot the rifle before buying that would be ideal. Or at least find some info about it somehow.
Prices will vary from $600+ to $3500 or more depending on what your looking to do with it.
Again, attend some matches 1st. That will help in your process.
Keith