If you are satisfied with the tri-vista then stick with it. IMO the players you are considering are not a step up and maybe a down grade. I would mod the the tri-vista if you are so inclined and resale isn't important to you. I have a RAM modded SCD-1 and it is far superior to the stock unit and IMO betters a couple of players north of 10k in direct comparison. If sonics are your ultimate goal then modding makes sense however if resale is important then be fore-warned as modded units do not retain their value. But if done right they do offer sonic bliss at least in my experience. Or as others have suggested find a used modded unit that interests you.
Chuck
Chuck