Banking: Very happy with Bank of Ireland Business Banking
Accounting: I'd second Xero
Car: From a purely financial point of view it probably looks like owning the car yourself and claiming mileage is the best return for you, however once the business gets busy the hassle of maintaining mileage records is very frustrating. Not sure what the journey lengths you'll be doing are, but consider an electric car, fuel costs will be 25% of a petrol/diesel and BIK is significantly reduced. If you need to do 300-400km per day just get a diesel.
Pension: Executive Pension plans are very tax efficient because the company can make all the contributions net of all taxes and the employer contributions limits are high. I set one up with Zurich directly over a couple of phone calls.
SURE funding: Don't know much about it, but if you do need to put money into the company consider doing it as a Directors loan, you can take it back out tax free then. If you put money in directly and are paying yourself from the company you're basically losing half your money in income tax, so even if SURE do match your capital you end up in a similar place to simply using Directors loans, with more hassle. Again though not an expert here.