In reply to Philip:
So my day job is selling cars to businesses.
A 1+35 contract is rare, a 3+35 is far more common but the question is who told you to ask for a 1+35 and why? I do deal with companies that specifically ask for 1+35 contracts and they have reasons for it. If it's your employer who's told you to go for 1+35 then don't try to buck the trend.
You will find it a lot easier to find 3+35 quotes on the internet so if you want to compare quotes then get people to quote on both 1+35 and 3+35 that way you will satisfy your boss and be able to cross check prices.
I believe Audi finance works on a limited commission structure for the dealer. Audi UK set the prices and the dealer can build in up to £600 commission into the finance. That should mean any dealer you go to shouldn't be more than about £15 per month different than each other. That is if ones claiming the full commission available and another is claiming nothing.
You will occasionally find brokers that can offer deals on the vehicles that are better than the manufacturers, when you find these it's usually a case that one of their finance companies has bought in masses of stock and are needing to clear it.
Best thing you can do is chose the spec of the car you want and get a quote. If it's less than your budget start adding options(and be prepared to pay more company car tax), if it's more than your budget start removing options or drop a trim level or engine size.
The rough rule of thumb I work to is £1000 of options is about £30 per month.
In terms of useful sites... Contracthireandleasing.com has millions of offers, it's also full of chaff you need to sort through.
Sorry if that makes no sense, it's been a long day so far.
Mark