Current sofas are from Sweetpea and Willow (living room, where we also have an unbranded love seat that came from ebay) and Marks and Spencer (kitchen). Additionally we have a small antique sofa in our bedroom which is rarely used.
The M&S one - a velvet 'Dante' - was another ebay find. £500 for second hand, but very comfortable. The Sweetpea & Willow, purchased new, otoh, looks stunning but is very high and seating hard. Admittedly we bought it for the design as we wanted one with antique styling.
I actually prefer a squishy sofa such as the fab pair of Tetrads we had years ago.
Others we've had include Multiyork (very good, shame they went bust), John Lewis (good quality, not terribly comfy), DFS (ok quality, uncomfortable). We've also had a few vintage sofas over the years - in fact one of our best sofas for snuggling/napping was a curved antique one we got for £200 ten years ago. Sadly it succumbed to carpet moths and had to go.
I'm already eyeing up a new living room sofa and will probably go for one (possibly the Isaac) from Sofa.com.