the old addage
"You get what you pay for" I think applies to about everything in our sport/hobby. The 10mm brings up some true issues about service life and durability, as it seems the cartridge is regaining some interest and some ammo is being made now that approaches the early energy levels. There were some issues with Colt Delta's early on, that I believe were eventually resolved, but the truth remains that high round counts in 10mm will work a pistol more heavily than lesser cartridges. (common sense if nothing else)
I've got no experience with any RIA pistols, and their base 10mm seems affordable. But I wonder about what they've done to their "10" to handle the bang/slam of the cartridge. Simply upspringing a 1911 is likely not the answer, as the Delta proved. Specualtion on my part, but based on the issues cropped up with the early Colt 10's.
What I have seen on a regular basis, are used Glock 20's for sale. Those typically sell for around $500 bucks and show little use. At the time, Glock claimed their G20 was "designed" initially to handle the 10mm ( a stab at the Delta, I'm sure) and their is no doubt the G20 slide is a massive thing. I do believe that the factory G20 spring, (at least in my earlier pistol) is light,and were I to shoot much full house ammo, I would upspring an early Glock 20. I do not run my pistol that high, typically getting 1000 fps+ from a 180, which is hot enough for anything I would do with it.
To me, a used g20, would be the best buy in the 10mm market.