I have a RPR in 243 and I love it. The trigger is great on mine. Ergonomics are great too, for me. It's been a sub moa gun for me after I zeroed in a little on load dev, and I believe I can still shrink that number. And better yet, if you wanted you could sell the unfired barrel for a reasonable amount and get an aftermarket from LRI, or Patriot Valley or whoever at a discount. You'd still have lotsa loot left over for a nicer optic, or ammo or reloading supplies or a nice dinner out with your special lady. From what I've seen the 6.5 creeds are the best shooting caliber with the Ruger too.
If you were going to build, it really depends on if you reload or not. If you do, the 6.5 Lapua seems to be the most accurate round of the three 6.5's . If you don't, obviously the Creedmoor would be your best bet as the cost of match grade factory ammo is very well priced. My opinion is the difference between the 260, Creed and Lapua is negligible as far as long range is concerned, you're not buying yourself much extra distance or wind/drop advantage with the added velocity over the Lapua. If you're worried about shooting past 1500 yds, you should look at another caliber. I'm pretty sure most competitions don't go past 1300 either.
I have a 6.5 Creedmoor and I absolutely love it, but I think when I rebarrel I'll be going with the 6.5 Lapua.
I'd be hesitant to suggest to anyone that hasn't shot alot of long distance to spend alot of money on their first rifle for competition. Your tastes will undoubtedly change as you go, and alot of times a good amount of the money you invested will be gone if you decide to sell for something different.
Summarily, I'd recommend anyone looking to get into competition to get a RPR in 6.5 Creed. It's the best bang for your buck right now. You'll undoubtedly find what you like and don't like about chassis, the caliber and competition with a smaller investment and the opportunity to recoup a decent amount of your money when you decide what you really want.
Whew, sorry....