Is that SG a Gibson one or a copy?
It's a Gibson from 2009-ish. They released a similar looking model last year, specs looked close but the list was way cheaper on that one
A buddy of mine had one of those Red Gibson Diablo SGs from around 2007. The sound was awesome and the neck is the fastest I ever played- I can just play better & faster on the SG than any other guitar. Arpeggios just fly off the fretboard. The maple top gives a nice sheen to the notes too. I'm not sure how the more traditional SGs play, but these Diablo & Carved Tops are outstanding. I found my SG on this site used for a great price.
Why d'you like the peaveys and Gutierrez?
I snagged a Wolfgang locally off Craig's list. I loved it so much I started to look into the Peavey HP Specials, which is the guitar Peavey made after Wolfgang left to another company. The HP is real similar to the Wolfgang, but has a slightly faster neck, an innovative optional tremolo lock system, and a few other minor changes that really make it enticing. The HPs were built in the same place by the same builders that produced the Wolfgang. Very sad they closed down just a few years later. Awesome guitars. I have 3 of them! They seem to possess a nice hybrid of tones from Les Pauls and Strats. Thick response of a LP with a slight twang of the longer scale. The neck is my favorite- it just fits me perfectly. Used HPs (if you can still find them) are a fantastic deal.
The Guiterrez was a case of right place right time. An ad here led me to a local studio where the owner needed some quick cash. In many ways it's my best axe- it is so clear and delivers huge quality on recordings. The play-a-bility is extraordinary. It has some kind of neck patent that makes it really stable, allowing you to try different tunings with little effect on the neck. I would consider getting another down the road- and now see the benefits in getting a custom made instrument.
I think trying different guitars/necks is the key. I had an Yngwie strat that sounded soooo good, but I just couldn;t gel with the neck- I couldn't pull off my tough runs on that guitar. The Wolfgang/HP neck really speaks to me, but others may be repelled. Once you find the neck you like, you can look at a pro setup and perhaps a pickup change.
If you're having trouble finding quality guitars on your area, you may have to buy used and keep flipping until you figure it out.
Good luck!