150 watts too much? Advice on amp please

I have been considering changing my amp (Marshall AVT275) and asked for some recommendations and people have been telling me I don't need anything so powerful for gigging medium size venues and suggest a 50w Vox is ample.
every other guitar player I see at these venues have mile high stack systems and there's me with my little combo of 150w.
I am aware that a stack doesn't make you a good guitarist and these musos have overblown egos so am not looking to compete with them in that department.
I play in a 5 piece covers band, (predominantly Rock & Indie with a bit of funk), and want an amp that will give a quality sound on all 3 channels and is sufficient in wattage so that is not pushed to the limits. I only have room in my car for a combo or stack consisting of head with 2 x12 cab. I also use a GT6 fx pedal so need something with an fx loop.
My local shops stock: Laney, Fender, Marshall, Line 6. Vox, Mesa Boogie but I am willing to shop online for other makes.
Any advice would be helpful

I would agree with the general consensus that for medium-sized venues, 150 watts is overkill and makes achieving a comfortable onstage mix difficult, as well as making achieving a decent mix out in the venue nearly impossible.

Keep in mind that a tube amp is much louder per watt of rating than a solid state amp. From your limited description of the type of sound/tone ranges you need to cover, and if your budget allows, a Marshall Vintage Modern 2266 would fill your needs. The 2266 doesn't achieve Panterra-type dropped-tune scooped-mids metal type grind, but it has great tone and it's capable of a very nice clean tone to '70's classic rock/'80's hair-band tones.

http://www.musiciansfriend.com/product/Marshall-Vintage-Modern-2266-Tube-Amp-Head?sku=480776

Adding an OD pedal in front of it along with its' own footswitch should give you enough flexibility to cover most anything short of the above-mentioned ultra-metal scooped-mids tones. It's rated at 50 watts, but trust me, 50 tube watts even through just a 2-12 cab is enough to have most any venue owner ready to fire the band if you get too happy with the volume control! I play in a high-energy blues band, and I use a 20 watt tube amp through a 2-12 cab and have plenty of power to spare. We mic everything and run it through the PA so that the PA does most of the heavy-lifting. This allows for a controllable mix and overall level, a better onstage mix, and results in an overall more professional sound with a competent sound man.

Cheers!

Strat

Thanks, but I use a GT6 fx pedal and don't intend using separates again. so, really need 3 channel amplification.

Thanks, but I use a GT6 fx pedal and don't intend using separates again. so, really need 3 channel amplification.

Well, it sounds like you already know what you want. Just take your pick of the 3 channel amps. Relatively speaking, there's not that many compared to one or two channel types. You had mentioned a 50 watt Vox, and all the 50 watt Vox'es are 2 channel amps, so I thought you might consider something other than a 3 channel amp. Sorry to waste your time, good luck.

Why aren't you using the GT6 amp models and just keeping your amp on clean?

Hey man, you didn't waste my time. It's good to hear all opinions and advice. It's just that I'm used to have the ease of 3 channels and a footswitch to change quickly.
Re: GT6 for amp models....I use some but not all replicate a true amp sound. I use it mainly for different effects and to replace keyboards. I am what you could call the rhythm guitarist who does some lead & fills in for keyboard parts and effects!
To be honest, the amp I liked the most for 3 channel sounds was the first one I owned; a 65w solid state Crate combo. Sadly, not sufficient for gigging at venues we play and now Crate are made in China and are totally substandard to the American stuff.