Phil,
It doesn't matter if you reg or res with this issue as TF 1-06 will no doubt have a standard kit list that you will be expected to follow. Hence, CO 1 PPCLI may be fairly liberal, but, Comd 1 CMBG may not be.
I'll give you my 2 cents based on our experieneces on Roto 2.
There is considerable pressure placed on deployed army elements, by the CLS/Army CWO, to wear issue kit. We are approaching the end of a very long procurment program (Clothe the Soldier) that was designed to move our equipment from the 40s - 70s technology into the 21 st century. A lot of time and money went into the CADPAT, ICE, gortex, etc. It is embarrassing for some elements in the army that soldiers are still buying their own kit. Hence, the CLS and Army CWO have been very direct in the use of non-issue kit with deployed TFs. Right or wrong, we all salute in the end and soldier on. But make sure you put your UCR's in. I had a very nice $70 holster from the PPCLI kit shop and I never wore it once and lived with the issue crap.
The Load Carrying Vest is not well liked by some elements in the infantry, in that, the location of the bayonet precludes pepper potting and the feeling that 5 magazines isn't enough in a firefight. This was B Coy, 1 PPCLI, view on the deployment and they fought very hard to be allowed to wear the one you describe (allows space for 10 magazines). In the end, I think they were forced back into the issue LBV.
If the LBV passed infantry trials, someone in the infantry must have said it was a good piece of kit. I would like to believe that the system trialed the LBV prior ot purchasing it. Does an infantry soldier require 10 mags on him at all times or only 5? My personal opinion is 5 is fine for most types of operations (vicinity of a vehicle) and the threat environment. But I'm not an infantry soldier and many will provide excellent arguments (Kevin??) as to why the current issue LBV is not adequate. I won't even get into the whole issue of the location of pockets on the sleeves of the CADPAT.
Finally, if you want to buy one, go ahead, but be prepared to be told that you can't wear it. If you are still willing to part with the $, then go ahead.
Cheers,