You say articulation and defination aren't a concern but I think if you get something that doesn't have defination you will regret it . Any way , I owned a shiva and i hated it had a fizz i couldn't dial out and "thick" its not . the Splawn QR is a killer amp but thick isn't how I would describe it ( I've owned 4) .All mesa amps that I have ever played fart out on the bottom end unless you mod them . I have owned 5 of them and they were all that way . The splawn nitro is probably closer to what you are looking for it is a thick sounding amp . You might also want to consider a friedman modded marshall you can find a used one for under 2k . Last and probably the best suggestion for what it sounds like you are looking for is a diezel einstein . I owned one and have regretted selling it every day since . It can cover all kinds of ground ,you may have to put a little cash with the 2k your wife is giving you but it is worth it . Also FWIW if you buy an amp you have never played buy it use so you can get your money back out of it if you don't like it.
BTW sounds like your wife is a keeper