I'd say unless you have a strong need for the money or some really good stuff that would go well at a garage sale, give it away! As Flylady says, you can't organize clutter! Are you really going to store all that stuff for 8 months? And then still have the enthusiasm to set up the garage sale too?
Maybe as a compromise you could sell a few big-ticket items using craigslist or some such and give the rest away.
Depending on how you give it away you can either get a deduction (charity) or possible future 'credit' (freecycling). I've had people on freecyle offer me first dibs on things because they know I often give away nice things that are in usable condition.
Funny the remark about people selling things from freecycle. When I re-did my kitchen I freecycled some old appliances that were functional, but for various reasons not suitable for the new kitchen. The guy who was doing the renovation was around when a freecycler picked up a stove. Renovation guy told me indignantly that 'That guy had all kinds of appliances on his truck, I think he's selling them or using them to set up rental properties'. I replied 'GOOD, glad someone is using them!'. I think of freecycling as like a gift. You give it to someone and they are then free to do what they want with it.
Ima, wish I was near you and could get some nice cheap windows
Regards,
TinyFish