Depends on what you want to use if for, Geoff. I have an ETX90EC (and old version) that I use for a 'grab and go' scope and with a filter to use on the sun for sunspots only. I have a PST for seeing filaments etc.
I like the ETX and have had one before when it was my only scope and traded it in on a Meade LX90. But the EC model is a bit noisy in 'goto' mode.
For 'spotting' I think that the optics are excellent. I bought the special 45 degree erecting prism for this work. I can pick out individual leaves on trees and feathers on birds. Its mainly for birdwatching that I use this part of the scope. I am rapt with it for spotting.
On stars, lunar, solar (spots) and some planetary work it is also excellent but you won't get much of the planetary features with the small aperture. Splitting something like A Cent is easy and it makes a beautiful double at that power.
But for serious work - DS objects - I wouldn't go any lower than 200mm.
Good luck.
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Cheers!
Popeye