so we're talking in any weathers?
I have a Hein Gerike Master V suit and to be honest it's amazing except in hot weather.
I will not buy a budget or mid range jacket ever again after spending on the premium kit. They last the extra time to warrant the cost and they also are infinitely more comfortable with actual waterproof pockets. If you're looking at premium suits you'll also be getting goretex proshell which is laminated to the top layer of material. This means the top layer doesn't absorb the water so the suit doesn't get heavy and stands a much better chance of being dry before you set off again in the morning.
The latest ride magazine has done reviews on the most expensive kit and they're doing the mid range stuff next month. I'm interested to see what the rating difference is like.
If you can spend the money outright then a good textile suit will be the only one you'll ever need. I used to spend £120ish a year on jackets until I got the Master V and said it had to last 5 years. A year later I bought the trousers to go with it and 3 years on it's still brilliant, having needed rewaterproofing in the wash only once.
If you like leather, Hein Gerike also do a leather proshell suit which has some reflective coating to help out with the hot weather as well as being as good as the master V in the cold and wet.
Just to give you some numbers, I worked out that the master V kept me comfortable during well over an hour journey with windchill down to -21C. It works at that and at +15C (missing, unfortunately the higher temperatures where you sweat like Jill Dando looking for her door keys). If you can find a mid range suit that does that and that well I'm all for it... the best thing is that the tech has got much better in the last 3 years with the lockout zips and the TFL cool tech.