hi. I bought the heq5 non-pro... in otherwords the basic model. if you buy the one with syntrek like i did upgrading to goto is as easy as pluging in a synscan or skyscan controller instead of the syntrek one you are given.
sooo it comes down to this:
$800 for basic heq5 syntrek mount + the cost of the controller. easy!
i took the cheap way out and purchased a version 2.05 synscan controller of a forum member (thanks

) so ended up with goto cheap.
also another way is eq direct (you are gunna have to google it) where you conect your syntrek mount directly to a computer thru a modded cable. this turns out very cheap indeed andone of our members is doing this right now... i believe he has even connected a gps to it.
hope this helps somewhat