the only difference is the stock. military uses the plasticized wood, tactical uses the synthetic. I planned on modifying my VZ so I just ordered the military version (I now have a railed handguard and Magpul CTR stock). The stock that comes with the tactical version has a longer length of pull and looks a little uglier
there are complete rifles and kits that have receivers machined for single-stack mags (i.e., the plastic 10-rounders) but only the double stack (30 rd) are imported by CZ. you'll see these sold with either stock/forearm. you can't use the 10-round mags in a CZ model since the magwell is not the same.
as far as the NJ mag limit, is NJ like Maryland where you can't buy or transfer a hi-cap in state, but you can buy one outside and legally bring it in and use it? you could just buy one and have the dealer remove the mag before shipping it to your FFL. then drive to PA or DE and buy some mags.
otherwise, just order a single-stack gun from one of the online vendors or Gunbroker.com