I hate wellies but I wear them anyway as I often have too.
I've been using a pair of Dunlop safety wellies for over eight years now and they have just sprung a small leak which is only a problem when walking through streams and such like.
They are similar to this pair
http://www.dunlopboots.com/products/category_specification.asp?Articlecode=S662
I've found the safety cap and soles to be invaluable for my needs as regular wellies offer much less protection than a leather boot.
Dunlop wellies start at around a tenner and go up from there. I've seen some really awful cheap looking wellies in garden and DIY centres that don't look like they'd last long at all (and offer very little protection) and then I've seen ridiculously priced "designer" wellies.
But perhaps you'd like some expensive Barbour wellies to go with your jacket. They were all the rage with the gentrified 4x4 country crowd when I lived in the West Country.
I reckon something in between the two extremes (designer - cheapest and best) will give the best value for money. I'm amazed by how well mine have lasted. Especially when you consider that once the cat dropped a dead mouse in one and it was a few days before I discovered it. I actually put my foot in it. That was gross. It (the dead mouse) stunk and I had to bleach the wellie which didn't do the lining much good.
After I put my foot in one morning to feel a live frog in my wellie I also started to shake frogs out of them in the morning (this was when I lived on a farm). I've since been very faithful to always shake out any boots before putting them on.
After living in the tropics where shaking out my footwear was second nature because you can find scorpions and snakes in it you'd have think I'd have learned but I didn't.