As a "southpaw" myself I am always looking....LOL I even tend to simply buy left handed guns I come across because I can.
Tikka and Savage both seem to offer a good variety of lefty's and I have been happy with Browning as well. I have a Savage Model 10 in 308 and a Model 11 (lightweight) in 7mm-08...also have a Tikka T-3 Stainless Lite in 270 WSM that I really love! I also picked up a Browning A-Bolt Medallion in 25 WSSM a couple years ago and really like how it handles and shoots but it too is a wood stocked rifle. If yer stuck on synthetic look at Tikka and Savage in my opinion...good triggers, smooth actions, detachable mags and accurate.