How much are you willing to spend all up?
Here's an alternative recomendation for you to consider.
Buy an 8" dob - $500 inc delivery.
Lets say $600 instead, get a collimation (guide) tool as well.
Buy a furniture trolley to move it easily - $50 max at Super Cheap Car accessories.
(Dave Waldo, one of our local SE Qld members here, modified his simply and cheaply to also function as his
height adjustable observing seat.
http://www.iceinspace.com.au/forum/a...1&d=1169251168
Another local member (Dr Morbius aka Randall) bought himself a Digital Setting Circle system 2nd hand here on the forum for $200, a quick bit of cunning repair and it was singing like a bird at Astrofest recently - but even if you have to buy the best and pay brand new price.....
Buy an Argo Navis for the dob - $1000
This will make the scope PUSHTO not GOTO (ie your muscles move the scope, the Argo navis tells you precisely where to push it to) but the Argo Navis system is arguably better than any GOTO you're likely to buy.
Total cost : $1650 - 8 inches of aperture, best guidance system money can buy (and totally Australian product), easy to wheel to the park, observing seat included!
How much Nexstar aperture can you buy for that price?