Oooo, a 16" 'bad-boy' as a first scope!
to IIS too, Gino.
The $700 you saved, is still in your pocket, believe it or not. You still would have had to frieght the Go-To scope as well, and still get some of the gear you mentioned,
.
Stick with the eyepieces you have for a time, and learn with them. You may be able to borrow different EPs from your mates at DAG. You don't need to go all out on the Tel-Vue range for quality either. Some folks seem to have tunnel vision with them and look at nothing else eyepiece wise. They are good, but it doesn't mean everything else is useless. I quite enjoy the GSO Superview eyepieces I use in my 17.5" dob.
I think you've made a brilliant choice in your push-pull selection rather than go-to. You'll learn your way around the sky a whole lot better, and quicker too. I think you'll also learn to use the scope a whole lot more intimately too in searching out targets this way too. And, like you said, you can add Argo-Navis & Servo-Cat systems down the track (Argo-Navis does the guidance, Servo-Cat gives the motors. On its own, Argo-Navis is a 'push-to' system).
Mental.