Good subject for this time of year!
We bought Hunters years ago, and they just rotted after many years (the heels were a bit small, and sunk into the lawn), so we reverted to Dunlop Greens at around a tenner! We used to have a lot of holly around the garden, so any wellie would puncture at some stage, £100 (phew), or £10!
One tip though, is to buy some instep reinforced insoles, as they increase the insulation, make them a snugger fit, and you can walk in them all day! Just a few quid on Ebay!