greetings from over the pond

iv been following the various topics on this board for a while on the side lines and you guys have been such a great help and the collective knowledge is 2nd to none.
Im currently putting together a plan for a demonstrater unit and to be honest if I just stuck a mag on the roof it would please most of the people here but I want something thats going to kick arse like nothing else, the base vehicle is going to be an estate probably a Vectra as I can get them cheap enough to be viable, what I have in mind at the moment is an LED lightbar prob the LFL Liberty and TIR6's in the front grill and maybe a pair over the front mirror im also going to mount 2 red TIR6's in the rear bumper with clear lens option fitted, its going to have full hands free siren unit and a low voltage switch panle. I do alot with motorsports and volunteer medics so the units going to be a mix of the two I think as there my main customer base at the moment.
What I really need help with is as I say I want a kick arse demo unit one that im going to spend as much time and money as it needs to be 110% and not rush anything if you were to say yeah bring it over let me see it what would you want to see on it equipment layout what toys, etc etc
I know you guys do this everyday and so far its been extra money for something I can do now I have regular requests for work and if it carrys on over the next 6 months then the money I have is going on a demo car and to start the business up as I have the tools already so at the moment the only costs im going to have are the demo and advertising thats were the demo car comes in I want it to scream quality profesionalism and my company name

Ok guys over to you let the creative juics flow
Al the best
Paul