Lydia from Soltek has said March/April there will be a Soltek Nforce 4 board, but not an Ultra. I have a 3 year old Soltek 75DRV2 and am happy with it. I noticed the caps are bulging, but I see all manufacturers have been affected by this. Soltek is even sending me caps so I can replace them myself.
How do they compare to ASUS or MSI, I cannot answer that, I have only had an Abit BH6 and this Soltek 75DRV2. (guess I do not upgrade much eh)
I am still holding out to see what the different companies are going to release and how they perform before I take the plunge. Waiting sucks though, CS:S with a 1600+ and 8500LE is rough at times! (looks like hell with everything turned off and in DX7)