Edited by bmeat - 8/11/14 at 11:02am
32db to 42db isolation, costs a bit more than the others you've listed. No idea about the sound quality though, but Etymotic is a good brand
Go see a Audiologist about Musician's earplugs at 24db. Runs like $60 with everything. No fullsized will isolate as well as IEM's or earplugs.
The MDR-V6 is probably the most isolating, but I can still hear anything around me.
In my experience the GMP 8.35 have the best isolation on the market, the HD280 also have a grate isolation, but maybe my head is to big and I had clapping force problems... was very painful!
In this case try to get the a used M-50 on ebay. Or maybe the M-40fs.
Go to some music store and try them for yourself...and this way you'll get all your answers.