I don't think the grass is always greener on the other side of the fence...
One thing you shouldn't forget is the fact that the airlines are big on seniority.
I'm not sure if they actually let you jump up the hourly payscale some 7-10 years or so - you would need that to earn 120(US)$+ an hour as an FO (Continental for example guarantees 72 hours/month).
Only if you would get a Captains position right away, you would make your 115$+ per hour from year two.
Even seasoned (10 years +) FO's flying for the US majors on 757/767 eg. would have to take a 25% (or so) paycut to transfer to the left seat in a 737. On the other hand, a friend of mine just started his 737 Captain training after only 3 years with the company. I guess its all about luck, not getting furloughed (spelling?) etc.
Maybe you should consider BizJets? Another friend of mine just became Gulfstream 4 Captain (he just turned 30) making 130k a year. With your experience and the feel for the aircraft of a helicopter pilot you shouldn't have a problem - except maybe with the schedule
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(All the numbers above are taken from airlinepilotscentral.com)