I had a look at the Kingquick, their premium box, I dont think its a multichannel that can tune boost too. So I think its a bit expensive for £200.
http://kingquick.co.uk/store/Fiat-Stilo-1.9-JTD-115-Diesel-Tuning-Unit-U1876.html
I also had a browse on the TMC website & his multichannel is £299.
The way I see it, the digital common rail box should cost below £100. The multi channel is the same, just with the option to tune turbo boost. 2 boxes in one, so to speak. So in my mind, I would say 2 channels at £100 each gives £200. This sounds like a fair price to pay for it.
So I think I am going for the synergy 2b with boost control plus a dash mounted switch which gives 3 settings - Off - Eco - Max
Total price £226.45
The website does not specify the 1.9 JTD 8V 115bhp, but I gave them a call
& they say then can supply for this vehicle.
http://tuning-diesels.com/index2n.htm