Chuck, you make a good point, one that I think makes sense. If I'm
going to get another refractor I might as well make the jump to 4".
BTW, I recentlly tried and returned an Orion 120ST which had great
light gathering aperture and showed a stunning amount of stars
compared to the little Pronto but, I felt, the optics were faulty as I
couldn't get solid focus with any eyepieces and stars looked a little
astigmatic. A real shame as the color wasn't objectionable using the
scope for its intended purpose.

Anyway, while I think the SKY90 is still a possible, I could keep my
Pronto for travel and move to a 4" APO and not really feel like I was
at cross purposes. After all, we always can use another instrument
that fits a particular need, right? ;o)

An earlier post in this thread mentions the Pronto's false color
compared to the TV76. No doubt, if one pushes it it will have more
color as it's only a semi-APO (which to me means it's a
better-than-average achro) but I never push that scope as I use it
more for wide field viewing. I looked at the moon last night though
with a barlowed 20mm TV plossl (meaning 48x in this scope) and the
view was wonderful with little, if any, color on the limb. Using it
on a TelePod makes high power viewing challenging due to difficuties
in tracking an object. I've had no fun with it much above 80x. If I
moved it to my GP that would raise the issue more than it does on the
TelePod.

Also, as Jon and I discussed via email, I think my C8 on its GP mount
which is by my back door is also pretty grab and go. The problem with
any of these larger scopes is the cooldown time. Grab and go to me
means take it outside and start looking.

Thanks for the replies so far!