the purpose of buying hi-fi/ ICE equipment is TO ENJOY THE MUSIC, not
constantly keep thinking about what equipment sounds better (even though a little bit about that may be part of human nature
).
In my VERY humble opinion:
1. It would help all of us who are so interested in ICE or have invested in it to spend MORE time thinking about what new music we can enjoy henceforth and 'widen our musical horizons"...
2. It is useful to think about exactly what INCREMENTAL sonic benefits you are going to get with each planned upgrade.
(a) There is a very real point of diminishing returns - this is dictated by economic principles governing the relationship between marginal effort & utility, the accoustic constraints of one's vehicle, one's own ability to differentiate between equipment and the nature/recording quality of one's favourite music
(b) You may actually realize that you either dont really care all that much for the extra improvement in sound while sitting in a moving vehicle or can't really tell the difference in your car while listening to your music...that perfectly OK
Note: some here may believe I'm being hypocritcal saying this, given what I've spent on my ICE...well, PM me - I'll be happy to discuss it.