If you are going to make a lateral move, now is the time to do it. You've gotten by on that first year pay this long, you can do it for another year at another airline.
That being said, why exactly are you considering moving on?
In my experience: (Trans States, Piedmont, Mesaba, AWAC), regional airlines are pretty much all the same. The pay is the same, give or take $1000 or so)
The schedule is the same. It sucks at the beginning, but gets better with seniority. The equipment is the same. (ERJs and CRJs) After a 6 months and few hundred hours you won't really care what kind of plane you're in anyway.
In short, the grass is not greener on the other side of the fence. The only real differece between the regional airlines, is where they base their pilots. So, if you are contemplating a change, I say figure out where and how you want to live your life, and pursue an airline that is compatible with that.
As far as upgrade time goes: Yes PIC time is important. But once you get your 1000 PIC, that's it. You don't need to worry about it anymore. You'll be as qualified as you need to be for a job at the majors. Do you really want to make decisions that will have lifelong consequences based on a short term gain? Add to this the fact that most of the majors aren't hiring right now, and won't be for a while, and it kind of takes away the urgency to get the PIC time. Yes the money is nice, but it's not like the difference between night and day. It is simply the difference between living in a small house or a medium house, or driving a used Civic vs a new one.
The other thing I have notice about regionals is that, at one time or another, they all have their "day in the sun". Every single one of them was "the airline of choice" for a short period of time. And every single one of them got their ass kicked later. Just look at my resume: Piedmont was considered one of the leading regionals out there. But then the RJ came along, they didn't get on the bandwagon, and got left behind. Back in '97 and '98, Mesaba was the place to be, growing like wildfire and getting AVRO's. Now they'll be lucky to be in business a year from now. AWAC was the leading regional in the United stable. I met many pilots who had left AE for AWAC because it was "better". But it turned out they were wrong. AWAC cost too much, got booted out, and had to pony up $125 million just to fly for USAir. Today's darling's are tomorrow's has-beens. The pendulum is always swinging.
Good luck with whatever you decide.