Are you anywhere near a shop where you can try some on? That can be invaluable. There are places you can get larger jerseys online (aerotechdesigns, love2pedal, etc.), but it can be a crapshoot on fit. Sometimes getting one long enough in the torso will also result in it being baggy. Sometimes not.
FWIW, though, almost all cycling-specific jerseys are cut longer in back.
I am about the same height and weight. I recently bought this jersey from performance, and it is a perfect fit (relaxed fit xxl) girth wise, I probably could have gotten by with an xl, but it more than likely would have sacraficed some length. I have several jerseys, but this is my most comfortable and favorite. http://www.performancebike.com/bikes...1595009_400060
Litespeed Liege, Motorola Team Issue Eddy Mercxk, Surly Crosscheck Cyclocross bike, Fisher Supercaliber Mtn. Bike
the performance jerseys are cut a little longer, descente are also cut longer in the back.. I am around the same size and height - I am 6'3 with long torso so this is also a problem for me.. The Hincapie 3xl jerseys and Cannondale 2xl would be a nice fit..
I'm 6'7" and get my jerseys there. They have a special tall size, which comes in M all the way to XXXL.
Also if you wear a jersey with a bib short in the same color/pattern, the jersey doesn't have to be as long. Because bib shorts go up quite a bit, and jerseys are often longer in the back. A jersey that's a bit short in the front is not problem when you're on the bike.
I have tried to find a decent cycle jersey but no - If they do make them in our size they cost to much to sweat them up and have enough for a clean one every other day - BUT - Take a look at Soccer Jerseys!!! - They are synthetic, hold their color, and come in many sizes and patterns to match your bikes...