Hi Craig,
I use an EQ3 with dual axis drives with a 4" ED f9 refractor on it. Wouldn't put bigger than the 4" on it though, it is very portable. Of the scopes you mentioned the 8" f5 on the EQ5 is the best, add dual drives and you should be happy. There is an EQ5 in the telescopes and mounts adds now for a steal of a price.
Andrews v Bintel
much of a muchness had great service from both.
Matt