Neither sounds good, based on the formats that you shoot. I'd wait for a good deal on a 4x5 enlarger with a color head attached. But all that stuff that comes with the Durst might just be worth buying the enlarger for. Keep all the extras, and use the enlarger it till you find a 4x5 color enlarger; then use it as a second enlarger (good for solarizations or image blending) or sell it.

If you get the kit, and have no use for the sheet film developing tanks, I'd be interested in purchasing them.