I think combined vascular is great. I strongly considered it after spending a couple weeks of my gen surg rotation on the vascular service but ended up pursuing neurosurgery instead. Do a little search here for some of the integrated programs, it shouldnt take too long to rustle up the good programs. I spent time on the vascular service at Lenox HIll hospital in NYC. Its a community hospital not directly affiliated with a med school, but I think it has some very solid training and exposure to every facet of vascular surgery. The residents do plenty of cases with good variety, get a lot of independence in the OR, and the location just can't be beat (if city living is your thing). They have a clinic that they regularly go to and even though they make for long days, I think the experience is invaluable. I also found the residents to be pretty close-knit, personable guys.
Lenox Hill just got bought up by the North Shore/LIJ system and I think they're going to be pumping plenty of resources into building up the hospital to be their Manhattan foothold. They also have a new med school going, and Lenox Hill already has academic affiliations with Mt. Sinai and Columbia, so I don't think academics are an issue. Its certainly a program I'd check out and had I pursued vascular surgery, it would have been high on my list. Thats essentially the extent of my knowledge of integrated vascular. Good luck and I hope you get what you're looking for!
EDIT: Realized I totally didnt answer your question, OP. Integrated vascular is relatively competitive, just due to the numbers. I'd echo Coldleg (gee, I wonder what he's doing for a living) and cover your bases as you would in any competitive surgical specialty - make sure you have a good reason for pursuing vascular, have a relatively strong history of research, solid grades and LORs from people who can really vouch for you preferably in vasc. surg, and be personable during your interviews.
