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If it's a Planetary refractor you want then the choice is easy. The Istar 127 R30 will act like a 5" f15 in terms of false colour, or lack of colour. The Istar comes with a Moonlite as standard, or Feather Touch, focuser and are built like a tank.
If you want to wait for a little while Istar are bringing out a new tube which is lighter and has a retractable dew shield.
The Istar will be more expensive the the Vixen is the only downside.
Send Mike Hardin at Istar an email asking about the new tubes. Mike always answers questions. Istar is a fantastic company to deal with from my experience with them. The only downside is shipping and import taxes, which is why I built my own scope using an objective from Istar.
Can't comment on the Vixen but would think that at half the FL, CA would be an issue. I went from 6" f8 to 6" f12 and the difference in CA is huge, almost a non issue in the f12.
Matt
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