On the BIK... well, its at least 5k more worth of car (lease price increases), the fuel costs more (and even if you are actually doing business miles, there is a HMRC cap on the amount you can claim per mile...) and the BIK difference is £1500 per annum (GTD 3 door manual base car vs R 3 door DSG base (the lowest emmission and priced R)).
I reckon thats about £250 quid a month easily you are out of pocket by (extra lease costs and BIK) and thats assuming that you aren't doing thousands of miles and getting short changed on your company mileage because of HMRC fuel expense rates. Certainly by 2019 tax year you will be.
Currently its 13 pence per mile for petrol...its what, £5.49 a gallon for petrol now? I reckon you are out of pocket by at least £2 per 30 miles in an R... and of course the figure will jump massively by the time petrol prices head back to £1.40 a litre.
Personally, I won't want to be driving for work and paying for the privilege.