Video light is great, too. I own a 100w dimmable Frezzi and it's gonna be fun to use this winter as we get some night shots for our brides & grooms.
Off camera lighting at night doesn't even have to be diffused. If shot properly with the right power and settings, the effects can be dramatic and quite stunning. Especially if you are shooting into the light with your subjects
blocking the blast or set the power low and have it just off to the side.
I would rent or buy some Pocket Wizards and start playing NOW. By November, you could have a lot of your issues solved and even come up with some great planned shots.
I did this one at the Atlanta Botanical Gardens this summer. There is NO landscape ligting in this shot - there are three Nikon SB28's controlled by four Pocket Wizards - one on camera and one on each flash. The flashes are bounced up to the
trees on the left and right and behind the couple. It's about a 1/4 to 1/8 second shot to get the night sky a little brighter behind them but don't be fooled - it was pitch black dark under there.

I had to visit the garden on two nights (before the wedding) to get the effect I wanted. I went with only one flash at first and then decided I needed three so I went back the next week and that's when I knew what I needed to do. I was only
going to be given FIVE minutes to get this shot with the couple as many times, that's all you are given when they want to be partying at their reception. ;o) They agree this was worth leaving for five minutes.