Deciding on what to make

If you multidevice you cant go wrong with a bishop.

From the Very Limited info I have of Enchanters, they don't seem to need a Bish that much? Maybe a little more than Nins do (need Bish, that is)?

If your Ench can tank enough (and single target mostly, if I read right), you're almost letter perfect for Assassin.  The only issue I can think of is: Are you good enough on two devices to manually control both at the same time?  I Suck at this and cannot control two effectively unless one is only button mashing (e.g. PLD spamming Guardian).   If you suck too, consider something that's less command reliant (e.g. AA build)

Then look at what one class is strong at, and complement it. Again, Very Limited knowledge of Ench, but they don't sound too Bish reliant to me.

Even If you are are skillled, your boss grind will be limited If you dont have bishop. 220 Is quite a long way to go for mblade and even If you get mblade, most bosses have aoe, mp delete and other crazy stuff. Sure you can grind boss faster with dps partner, but how do you restore your hp after each fight? Use pots or sit? having bishop gives you consistent grind and Is less stressful when playing since It Is easier to manage. Buff bless, buff resurrect, heal occassionally,etc.  after nemesis you will use bishop for mob grind. So ench focus for boss, bish focus on mobs.

I'd love sniper the only problem is taking it through mq and lvling. I'd either have to spam pots or kidnap a bish to heal. At 220-240 tho that DMG *^*

I'd say Assassin. For leveling, you would basically just end up leeching a Bishop it to 180. If you gear it then you would use it to leech Enchanter for leveling. If you don't you would use Enchanter to leech Bishop pretty much. Assassin+Enchanter work well together leveling but if you are well geared it's probably better to stick to Roches/Baum Warriors when they come out for the higher HP.

For boss farming, in most cases, my main problem is finding a DPS. Enchanters can tank 90% of in game bosses without heals. If you have an Assassin DPS will not be a problem lol.

Monk would also work as they have good synergy with Enchanters. However you gotta decide between Geo Build and Claw build. Geo build probably won't end up benefitting from Freeze/Stun if it's just you though. However Geo build can Heal the Enchanter, use Bless, Aegis, and Chakra on the Enchanter, and DPS at the same time. Claw build provides the same supportive skills, less damage, but if you gear it right you can almost completely ignore it and it can take care of barriers for you.