Adidas Approach cart bag. My club has some embroidered Titleist stand bags that look really nice and I've been looking for a stand bag for the days when I want to walk so I think I'm going to pick one of them up soon as well.
Update: My RJ Sports Ace did not last long. The fabric on top began shredding within the first six months. I will never buy any RJ Sports bag again. It's a piece of crap!!!
I replaced that piece of sh!t with Sunmountain Hybrid. I had Sunmountain bags before and loved it except the sponge in the shoulder strap got all bunched up and became useless after 3 years of heavy use.
2010 BSG stand bag. IMO the best of both worlds, being just about as bulky as i would be willing to carry as well as functioning very well when I use a cart. Seems to be holding up pretty well so far. My one complaint would have to be that when you are at the full 14 [or more, if going to experiment at the range] it can get pretty crowded. Overall I don't see myself getting a new bag for quite some time.
Just ordered this same bag in the limited edition chrome and red. Pretty pumped to try it out. Right now I'm using the callaway razr stand bag but the set up on the cart doesn't really work well for me.