If you know which neighborhoods you'd like to live in, it's best to have your Buyer's agent send you listings now. You'll have the opportunity to discover what is available currently in your price range and how quickly those homes typically sell. I think it's smart to be ready for a quick close and at the same time, I'd mention you might also be prepared for a delay (in case something unexpected comes up in the sales transaction for your current property).
Since our market is a bit 'light' on available homes for sale, I'd suggest having a discussion regarding available options with your financial professional. There are a variety of 'ideas' lenders may offer and it's wise to learn about the avenues you have available (so you can make an informed decision).
I realize it's a tough spot to be in, yet just know you are not alone. Wishing you all the best and I'm sure everything will work out just fine!
When you want to buy a home the best place to start is to hire an EXCLUSIVE Buyer Agent, not just a Buyer's Agent. EBAs only work with homebuyers and there is never a conflict of interest that will jeopardize your negotiating position. Contact http://www.naeba.org for a referral in your area.
I've written a best selling book called Buying a Home: Don't Let Them Make a Monkey Out of You. It'll teach you how to buy a home and get a mortgage without getting ripped off. Follow the link below.
Best of luck!
If a home isn't immediately available, when you're ready, you'd be better off putting furniture in storage and renting for awhile. Don't settle on a new home unless you really like it.