I have to go with my 338/375R. It just looks like a 30-06 on roids. Loaded up with a 225 AB or a 250 VLD (HURRY UP AND MAKE A .338 ABLR!!!!!), it just looks really cool.
A close second place if a five way tie! The 270 Weatherby with the 140 AB, STW with the 168 ABLR, 280 AI with the 150 ABLR, 375R with the 260 AB, and of course the 45-70 with the 300 BT all seem to make me just as happy!