Echolyn

It's really hard to say. I do believe at one point in the 90's they were as well known(or at least very close to it)as Anglagard, Spock's Beard, Porcupine Tree, the fledgling Flower Kings and Ozric Tentacles. However, because of dissatisfaction and frustration with their record label(sony at the time)they broke up at a very crucial time in their career and splintered off into two other bands(Finneaus Gauge and Still which became Always Almost). They were on the verge of being a big time second or third generation prog band(along with PT, SB and TFK)but because of the split it never quite happened and they lost their momentum. Still, they were nonetheless a big 90's prog band regardless. Anglagard could have been even bigger than they were for similar reasons but like Echolyn are still fairly legendary "90's" prog band. Echolyn of course did eventually reform a few years later but their sound changed and became somewhat more mainstream sounding although mei was sort of their "thick as a brick" in a way since it was a very obvious full blown prog album(with one track taking up the whole album). So yeah they could have been bigger and should be more well known but it's not like they are unknown among most knowledgeable prog fans. In fact you could say the same about a lot of modern prog bands. 

I've been around a little bit here and there.  My priorities are different than they were ten years ago (three kids, mortgage, etc. etc.), but I still love the music.

Been listening to a lot of RUSH lately.  Sad news.