Hi Steve,
I think you've answered your own question in some respects because you don't seem too keen on a second hand unit.
Its is a mistake to buy your first Truck Mount to a sum of money and let that sum of money pick the machine, like the Prowler you just mentioned. The Prowler is a fine machine and may well fit your needs perfectly and if that is the case you would be right to invest in one.
But there's more to it than just that. You must also consider the amount and type of work you have now and the amount and type of work you hope to do when you get your Truck Mount. If you aspire to get into, or more into the commercial market then the Prowler may turn out to be a bad choice because the bigger the jobs, the more powerful the machine you require to do them.
You really need to sit down and have a really good think about where you want your business to be in the next five years and then decide which machine best suits your plan. I say all of this because I've met so many people over the years that failed to consider this aspect of buying a Truck Mount and found that the machine they bought wasn't capable of generating the income to pay for it.
But if you want an off the cuff piece of advice, I'd be looking out for a good mid sized second hand machine in a van that may not be new but will instantly provide you with better quality, quicker cleaning and access to far more lucrative markets and change in your hand from £10K or less.
If you need any further help, please feel free to call me: 07810 522063
Simon