The only people who will think you are a twit are the people who don't know what they are talking about. I play with a 15" combo and a 410 cab under it. I get to play it at low volume, it sounds great, i can see what is happening and I can hear what is happening.
The last gig we played, (small pub) the sound guy said, "that's a bit over the top isn't it?" as he walked past our two guitarist's 2x 412 cabs and tube heads.
He then mentioned later on that he had a GK 210 700rb combo that he blew up.
I rest my case