I’m building a Tikka stainless 308 now. I have already listed the differences from it to a Sako 90 peak 308 in another thread. Tikkas are great but there are levels in this game. Functionally they rock, still a cookie cutter one size fits all and leave lots on table subjectively. Op seems to be looking for a bit more than what tikka has to offer, just pointing him to alternatives as I’m into similar thing right now.
Im a little confused by your statement about levels. If you think a Tikka is below a Ruger American, you should probably start asking some questions.....I'm well aware about said "levels" i've owned, hunted with and carried almost every brand of rifle from full custom Defiance's, KS Arms to Fierce, Gunwerks, Christensen Arms, Kimber Mountain Ascent, Weatherby Mark V Backcountry, numerous Sako 85's, Tikka's, Browning's, Remingtons and Savages, I can keep going....The OP isn't exactly clear on what he wants, what his budget is, etc and imo it doesn't take much to beat a Ruger American. They're VERY entry level rifles. Can you do them up and make them nice? Sure. But for what you'll spend on them they aren't worth it. Ive had 2, both shot good but the actions felt like you were running sandpaper between the bolt and action. If he wants something a little nicer, same weight range and honestly not much more $$ than an american, a Tikka fits his bill, minus the adjustable stock. But the T3X's you can somewhat customize LOP and your grips, cheek height you cant on most models. But as he stated, he can build his own stock or you can buy a decent B&C for a few hundred bucks, or a nice AG Composites for $1300. There are more and more options for them, and they're becoming more and more available for Tikka because people are finally realizing the potential they have. Slick action, stupid accurate (if you cant get a tikka to shoot, you're the problem) fantastic triggers for factory, and they're moderately light weight when you have one in a synthetic stock. Even my Tikka T3X Laminate Stainless, scoped is only 8lbs. My Tikka T3 synthetic stainless in 300 wsm, scoped is 6 3/4lbs. Both wear Leupold VX1 3-9x40.
If money is no object then he should build a full custom on a Defiance Anti, AG stock, Carbon IBI barrel etc etc and get exactly what he wants fit for him, but it'll cost north of $5000 to do it.
Id honestly keep tabs on the EE here, the odd Kimber Mountain Ascent, Fierce Carbon Rival, Rouge, Edge etc. pops up, they're extremely light. My Fierce Twisted Rival is very accurate AND if you don't like it, they hold their resale value, chances are you wont lose a lot of money on it. That could be said about any higher end used rifle. Fierce, Christensen etc all pop up regularly for decent prices.