Thanks for all the responses.
After chatting with Terry Wright today he gave a very competitive price on a SD360/DF20AS package so I think I will go with that 8 months early - at the moment he has stock and can hold pre-Brexit prices which I foresee will rise due to exchange rates next year.
I looked at a used Aerotec 380 on Ebay but figure I'm better off with a new Excel for the same money. They both seem to be good quality, I'm not going for the aluminium floor version unless you guys give me advice to the contrary, the dogs blunt claws would not grip it too well.
I have lots of newbie questions which are off topic so I'll start a new threads for those. Thanks guys.