What do you all think about possibly having my 6500's spooled up with braid and using them for cod? I know the line capacity is there but would a spinning reel be ok for the 150-250 feet I'll be fishing in, do you ever see anyone using a spinning reel on the cod/haddock party boats?

Never have!! But weirder things have been done!

I would stick with conventional if it was me.

I have not used a spinning reel and braid for cod but I have jigging for amberjack 200 ft down in Tampa wreck fishing. Worked great - There is a reason they call them reef donkeys.
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It'll will totally work.....If you are "jigging", You will need a "beef stick" of a spinning rod. I have a friend that cut a 9 foot lamiglass rod down to 7 feet and uses it as an ALL PURPOSE boat rod....live lining, jigging, clams, the whole deal. Seems to work out pretty good for him......

I do have a couple of the Daiwa BeefStick rods that I got while I was up in Portland ME a couple of summers ago, $25 each, good deal, heavy poolcues of a rod but will work well I'm sure.

Should I have these reels spooled up putting either mono or dacron on first and even let the shop do it for me? Going this way would be much cheaper than buying new reels for this fall, and for my newbie fishermen for cod such as my dad, a spinning reel would be so much easier than using a conv. And the retrieve would help getting the rig back up to the boat for sure.

As long as you have the reels, you may as well try it. But believe me, all those guys aren't using conventional reels because they like to do things the hard way! :)

also, your gonna drop more fish if your using a spinning reel due to the fact that your going to have to pump the rod.

still a touch early to be talking about cod fillets ;)

Should I have these reels spooled up putting either mono or dacron on first and even let the shop do it for me

My rods are pure Braid, when you get hooked on a wreck or something 200' down, and you have to cut the line, it will empty a spool faster then you know!

If you use braid run a mono leader that will break below the braids rating. This way when you hang, the mono breaks only and the braid will still be where it belongs; attached to the reel not the bottom.