RE: Selecting a 6 CH radio, Which one??
Pretty much all of the major brands are equal quality. Here are the ones I can think of in a few seconds.
Hitec.............Futaba...........Airtronics
JR.............Polks Hobbies........Multiplex
Now, you say money is no object. If that's the case, you might as well blow off these "toys" and buy the latest and greatest whiz bang 10 to 14 channel unit. The Futaba 14MZ is probably the 'be all / end all' of RC transmitters as of today. It will set you back around $2300 but you're not likely to outgrow it.
Seriously though, any of the major brands that has the features you want will last a long time and likely will not give you any problems. If you'll be in an RC club and working with an instructor, getting something compatible withe his equipment would be a good idea.