Yeah I didn't personally care for that myself. 6x DIMM slots in a quad channel setup is just a downright poor engineering choice imo. For myself however I've pretty much decided on a 4x4GB configuration, so at the end of the day it wasn't a huge detraction.
There are also some Gigabyte boards that offer this same level of SATA support while doing 8x dimms. If you use the power search feature at Newegg you can search via SATA 6Gb/s connections. Just pick the 4,5,6,7,8 options, 8x dimms, and LGA2011 to give you a decent idea of what you're looking for.
The search query url. Just keep in mind that while all of these boards offer a minimum of 4x SATAIII ports, not all of them will offer them in RAID configs. The Extreme6 is an example of this. Just make sure you view the Details screen to ensure it has the support you want.
If durability and longevity is your primary concern I'd look towards the Asus Sabertooth or the MSI military class boards. While most manufacturers have jumped on the premium capacitor bandwagon which is great, a motherboard is still only going to be as durable as its weakest component. The ones mentioned have been built and stress tested with longevity and stability as the foremost factor.
Of course, that could also just be what the marketing team wants to sell. I do know I'm using the P55/1156 version of the Sabertooth and I have nothing but love for it. Two years strong now and it's never once gotten in my way or given me a cause for alarm.