There are not a lot of "good" cheap options for rifles in this caliber IMO, the TRG 42 is a great shooter with just about any factory ammo and gives a lot of value for the money.
A full custom rifle is good if you never plan on selling it (people always upgrade or outgrow).....Resale value is next to nothing in my experience unless someone was going to build the exact same thing comes along (never happens)
DTA or now Desert Tech was really good value for what you got, now with the huge price increases it is hard to justify when looking at what they use to sell for.
If you buy an entry level rifle and spend a ton reworking it over a few years only to outgrow and upgrade anyways, you should have just saved for a better rifle to start with IMO. At best, You will have lost all that money you spent on the upgrades, at worst, you have even reduced the resale of the rifle further than if it was box stock
my .02