I recently went through this same process, going from to celestron 8x56 binocs to a 114mm f/8 tasco 11T EQ. The tasco was so undermounted it was really tough to use on anything besides the moon. I bought a vixen polaris mount and I'm really happy with it now, but that alone cost me 200+. Then I added a RA drive, 1 1/4 focuser, eyepieces, scope rings ... you get the drift.
The more I think about it, these scopes are like punching a hole in the ice beneath your feet. Once the hole starts to open, get ready to fall in and spend more and more trying to get them to work. If you are an experienced astronomer with an astro-junk pile you might get away with swapping out parts, but for me ... money pit (I mean, 700 or so all told).
If I had to do it all again, I would look for a mount/scope combo that came with eyepieces, scope rings, dovetail, etc. That stuff adds up quick!
New, I would be curious about the Astroview 90 from orion, the astroview being a minimally acceptable mount similar to my polaris and the 90 being an f/10 refractor that I would guess is a reasonable performer given the specs. That's $300 -- eyepieces included!
The SVP 8 is also really not a bad deal. I wound up spending that much anyway. I'm sure meade and celestron have similar deals. I don't have enough experience to have developed brand loyalty, except that I hate paying for shipping.
Used -- who knows? I've seen skyview pro mounts with scopes on them recently for reasonable prices. But I would be looking for included eyepieces and stuff.
Anyway, good luck whatever you decide. Hope my experience is useful!