I use to play on Vox but I /testcopy to Test Server and never looked back. It's nice having Gold Membership and more plat than I need on all my guys and not having to pay for it

I play 4+2 - Ench, Mage, Bard, Wiz with merc tank and merc cleric on Test Server. I added the Bard for utility (buffs, snares, debuffs, crowd control).

1. I don't play an SK but my understanding is it will be as good as J5 tank around 75 to 80.

2. No mercs in raids.

3. 3+3 is fine, 6 will get you 12 (6+6) if you want to 2 group world bosses or PvP.
6 box gives you more control over your team.

4. We Multibox, gotta be a little crazy