Hi Laura,
Just thought I'd add my 2 cents worth!.
After nearly 3 years of waking up several times a night due to pain, I finally persuaded my husband to give up the water bed and buy a latex mattress.
We've had it for 4 weeks now, and at first it was a bit weird getting used to a different mattress, but now I'm sleeping through - BLISS.
I don't feel my husband in bed with me now and my back and neck are supported properly.
The only down side to the latex mattress is that they are VERY VERY heavy - something we didn't think to check when we were in the shop. My husband now has to make the bed on washing day, but apart from that I can make it in between washing days.
In Australia they cost approx $1500 upwards. We paid $1550 delivered. (or should I say the insurance co. paid for it! We bought it and they reimbursed us).
Hucky
