I've used quite a few Line6 computer products and I like the bang-for-the-buck but would never, ever put them in the pro sound field. Fun to play with, cheaper than pedals, but takes me quite a bit in fiddling with settings + post production to make them worthwhile (same goes for my little MicroSpider amp, which is mostly for busking).
One thing that came across my radar was the Kemper, which seems to be that technological achievement you might have in mind. I've never played/heard one (that I know of), but I think it has a pretty good reputation thus far. Link: http://www.kemper-amps.com/profiling
Since I moved out of the motorhome (the reason I sold my JCM 800 and downsized to a tiny Vox was because I was living in ~200 square feet for four years, while traveling full-time), I've since bought another Marshall. It's a 50W JCM 2000 (I think...maybe 900) that I picked up for $600 (and a 4x12 cab that was a few hundred more), but it rarely gets used. The Vox sounds great and is right-sized for indoor use.
I'm really happy with my Vox, honestly; for most things it sounds as good as any amp I've ever owned, and I've owned some good as hell amps (I've also had some old Fenders). I wish it had a bigger speaker; a 10" would make it the perfect amp. It's got an 8", and sometimes low end stuff sounds pinched.
I have owned a lot of classic gear over the years and have sold most of it. I view it as borrowing it from the universe rather than "owning it". If I buy it used, and I sell it for what I paid for it, or more, I find I have a healthier relationship with my things (I'm in charge, not the things). When moving into the motorhome, I sold a lot of great stuff. Antique furniture (my mom is an antique dealer, so my house was nicely furnished), synthesizers and guitars and amps, etc. The cost of keeping it was the cost of storing it, which would have added up to far more than its value over four years.
Anyway, these days, I have a good big amp (the JCM2000), a good little amp (the Vox AC4V), a good acoustic guitar (Gibson J45), a good electric guitar (Schecter from when Schecter made really good guitars by hand in California), a good bass (G&L L2000), and a good drum set (Roland TD4S). That's my minimum for musical happiness, and I try not to keep anything else, even if I acquire stuff temporarily to play with it.
Good attitude towards life.
Too bad where I live we can't buy good used gear. Nothing good ever comes by, people hoard and hold on to it for their lives, and when it does come by, it's overpriced to the point it justifies buying new.
99% of the stuff sold in stores it is cheap generic clones of Fenders (MOSFET amps and Stratos).
Some of what goes on in audio is snake oil. In fact, a lot of it is. But, modeling amps and tube preamp stage gear still doesn't hold up well against a good tube amp. I bought a new amp a couple years ago, after having used the same amp for ~20 years (a 1984 JCM 800). I tried every amp in the small size range at two guitar stores. The clear winner was an all-tube Vox model. The modeling amps were way down the list, which was disappointing. I really believed we had the technology to replicate good amp tone (and some guitar amp sims on computer are reasonably good)...but we still aren't there.
And, the preamp tube with transistor volume stage amps were also clearly inferior to the master volume style all-tube amp I ended up buying.