I have a TT rifle shot gun vest (some rifle mag pouches are replaced w/ shotgun loops)
Very nice vests, Good girth adjustment when you go from hot to cold environment.
In addition to the velcro flap closed back sleeve for camelbacks, the inside back of the vest also has an open sleeve for a camelback. you could carry two camelbacks or use the outer pouch for other stuff.
I'd hazard a guess that for your needs, the utility vest would be just what you need.
The modular vests, racks, etc. are great, but I think the TT vest you like would be fine, and the cost would'nt be too bad-modular has a tendency to get real expensive.
I don't have any problems w/ back pack usage with these vests. At work I don't too often carry a back pack, but when I do, it's w/ a camelback, radio, and small fire extenquisher under it. Plus the long gun sling.
I do have a ballistic vest on under the vest, so I don't notice any problem w/ that gear mentioned stabbing me in the back.