Going to GoJet, in my opinion, would not be the best move. If you were to upgrade, as you are obviously aiming for, you'd be on perpetual reserve and hardly fly.
Captain reservists in Chicago are currently going back to the summer of 2009 hire dates, and those guys are hardly flying. I know a captain that has flown less than 10 hrs since new years, and has been spending a lot of time in a crash pad.
Keep in mind that some aircraft are out for Mx and a couple are being painted, so GoJet block hours have been reduced as a result. This caused a reduction in lines so typical line holders ended up back on reserve. That will change in a positive light as the dust from the delta addition settles, and freshly painted UAL aircraft return to service.
I'd go out on a limb and say that going over now may be a bit too late. It would have been a better move a couple years ago.
As far as making UAL contacts, that ship is also beginning to set sail. Recalls have began, as a large number of the jets for jobbers have 2000-2001 hire dates. The rest are expecting to be contacted by late summer or early fall.
Best of luck in whatever decision you make.