It's all up to your personal preference and what you are looking for.
What would really matter is barrel lenght and threaded muzzle. If I was making the choice in your place, I'd go for the cheapest one that I would then slip into a KRG chassis in due time.
I would recommend to go 24'' with a 6.5 if you can, and a muzzle brake is a nice addition.
If your mind isn't completely set on those two choices, I would recommend looking up Tikka's T3x CTR in 6.5. They come right into your price range at 1395$ for 20'' or 1499$ for 24'' and are crazy accurate little shooters out of the box.
EDIT: no I don't think R700P comes in 6.5cm either.