I bought an expensive pair of Acerbis 'Korp' trousers (http://www.getgeared.co.uk/ACERBIS_Moto ... d_Jacket_2
) , over boot style with elastic and velcro gaitors to keep water out of boots if it gets that deep. They are lined, water proof, hard wearing (heavy nylon) they have belt loops and adjustable waist band to get the fit just right and one handy pocket for your change. I think they were 70 quid. Expensive for me I can tell you, but they are good kit. I expect them to last ages and they aren't too lairy.
However, I then decide to get a jacket, could not bring myself to buy a Acerbis matching one, another 100 quid... so, I bought a second hand Akito Sierra jacket (http://cgi.ebay.co.uk/Akito-Sierra-Moto ... 563f36d922
) for 30 quid (from an auto jumble) It came with armour which I removed as I like to wear a mesh jacket all in one. It also has 2 liners, a second water proof membrane and a really good quilted liner. It has loads of pockets, loads of vents if you need them (i do) and is again heavy nylon and sturdily made. Only issue I have had is with one pocket popper falling off. Did I mention it has orange detailing which matches my bike?!
Rambling over. If I had found a pair of matching Akito sierra trousers I would have bought them too. really good stuff.
Hope this helps