I'm thinking a $100 chair from Office Depot would be a good idea. (I'm an independent working from home, and I recently bought an Aeron, out of my own pocket) I get the whole long hours, bare bones startup incubator thing, but just like we often use MacBooks instead of $249 WalMart specials, seating isn't an area to skimp on! :-) (as for the couch, I think I couldn't do that for long as an alternative - my MBP Retina gets way too hot for that)