Hi all - 1st post, so be nice

I'm looking at buying an Omega in the near future, and have been looking round to see what's out there, costs, models, service/maintenance intervals etc and have a couple of questions I'd like help with
1. I've seen that VX say to get a service every 20K, but I've also seen people (mainly in that "other" VX forum) mention a "Major Service". When would the car need one and what's the difference? Also, what would be the rough prices for a service/major service at a local or VX garage?
2. I've seen a few Omega CDX's, but have seen the odd MV6. From what I can see, the differences seem to be you get better seats, no "wood" effect on the dash, different alloys, some more BPH (comparing a 2.5/6 CDX to a 2.6 MV6). I assume the suspension will be more sporty too, and the MV6 would have a boot spoiler. Am I missing something "amazing" here? I like the look of an MV6, and from what I can tell the running costs would be about the same as a CDX from a fuel & insurance point of view, but do they cost a whole load more to maintain?
btw - I'm looking at getting a face-lift estate (2000 onwards). Also, I'm not a mechanic so would not do the service myself - I would do the odd little jobs like air filter.
Thanks in advance.
