Nice!!! I am a fan of V30s too..
I was addicted to cabs too....I found for my 2 piece heavier band that a ported high powered 1x15 peavey cab was good enough. Best part is I got it free from my drummer! I love that Peavey thing so much I sold all my other cabs!!! they just didn't compare to the overall fullness and low end the Peavey had and I owned some nice cabs. People look at my rig now and think its a joke (1980s carpet covered Fender Solid State M-80 Head and carpet covered Peavey 1x15) but I don't care because I know the second I turn it on and crank it up it sounds awesome and fills a room!
I hope you like the C90s though...I was not a fan of the one in my Mesa Express 5:50 combo I had... I found it had harsh ice picky highs. Could just be the small combo effect too, I found V30s to be very smooth in the highs and never too ice picky even though others complain about that.
Interesting because I found the opposite with the V30s, at least at first. I have the exact same amp; 5:50+ and actually, as I recall it was a little harsh at first but now the C90 is well broken in and it sounds great in a 1x12 open back cab.
To me the big lesson I learned in all this is to let your speakers break in. I had always played through well-used cabs before and never played new speakers much. I think they all sound kind of harsh at first and you don't identify the real character of the speaker until you've logged some time on them.
That sounds like a cool rig with the peavy and M80. I bet it will also survive just about any abuse you can throw at it too!
Nice!!! I am a fan of V30s too..
I was addicted to cabs too....I found for my 2 piece heavier band that a ported high powered 1x15 peavey cab was good enough. Best part is I got it free from my drummer! I love that Peavey thing so much I sold all my other cabs!!! they just didn't compare to the overall fullness and low end the Peavey had and I owned some nice cabs. People look at my rig now and think its a joke (1980s carpet covered Fender Solid State M-80 Head and carpet covered Peavey 1x15) but I don't care because I know the second I turn it on and crank it up it sounds awesome and fills a room!
I hope you like the C90s though...I was not a fan of the one in my Mesa Express 5:50 combo I had... I found it had harsh ice picky highs. Could just be the small combo effect too, I found V30s to be very smooth in the highs and never too ice picky even though others complain about that.

Well here it is fellas - the C90s have a much clearer, punchier low end than the V30s, cleans sound great. It is actually louder too (like that needed to happen). It's exactly what I was hoping for - not near as much squishy low end breakup, and mellower highs. Still needs breakin but it pairs perfectly with the 5:50+ head.
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I was running my Marshall jvm410h full stack and my Peavey 5150 full stack together in stereo one time, and the guy that was outside mowing my yard said that he could hear them over the mower while mowing. I thought that was funny as hell.
Lol this is the worst place to come to ask if you SHOULDN'T buy/keep something. I love it.....