having shot 4 of the barrels on your list i will tell you this...bartlein has been the most accurate(and more importantly)consistent barrel ive ever shot and is the only barrels i will use.
as far as contours...i wouldnt go smaller than .875 at the muzzle which would be a heavy target contour...ive been shooting the heavy varmint contour but am going to switch to the heavy palma because its 1lb lighter...here are the bartlein contours....

http://bartleinbarrels.com/contours/

if you dont have a smith and a reamer to chamber and thread your barrel contact these guys they will do prefit bartleins...

http://bugholes.com/index.php?route=common/home

id have the barrel thread for a brake and install one i could time myself...id also skip the fluting because IMHO its a waste of money.