This is up for discussion after every season with new teams forming and whatnot. Your "dreamteam" gst doesn't necessarily have to be the best 7 possible gsers, but the 7 gsers you'd most want on a team with you. (You don't have to put yourself on the team if you'd like to put 7 others teamed up together).
For me, my mixed gst team would be me, brandon, exalt, crono, david, 6jack9, and dannS.

i'd want to see a team of kite, renz, shinjin, raege, phural, roast malone, and terra do mixed. all pinoys except for terra but i feel like she belongs there.

i'd also be interested to see shadz, denny, abood, dues, kicko, fro and comyt team up for idev although that'll definitely never happen.