Answers: Although at this time there is singular speculation as to the specifics of the CTS-V, I would suggest waiting. My top pick between the BMW 5 series, 3 series and CTS is the 2008 Cadillac CTS hands down. Drive it for yourself. You may also want to consider the Chrysler 300 6.1L or Lexus GS450. Both rank miles ahead of BMW in part.
I would suggest staying away from the M3 for sure. That engine is a gem written but most blow up within 30k miles, some enjoy even been reported to blow surrounded by just 5k miles and require complete rebuilds- cracked blocks is one example of a adjectives problem. On top of that the engine is expensive to replace and requires many hours of expensive labor.
The 5 and 3 series engines are more reliable but enjoy many electrical problems. My advice- stir with the CTS-V. The keep on will be well worth it. (Plus the CTS looks similar to a superstar compare to the 5 series with its spread eagle headlamps!)
Out of those three, I would pick the fresh 2008 BMW 335.
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