Hi DarklyDreaming,
If you are a side sleeper then you would definitely need a softer/thicker comfort layer to relieve pressure points than you would need if you are a back or a stomach sleeper. There is more about primary or “deep” support and secondary or “surface” support and their relationship to firmness and pressure relief and the “roles” of different layers in a mattress in post #2 here and in post #4 here that may also be helpful in clarifying the difference between “support” and “pressure relief” and “feel”. A mattress can have both “firm support” (to help with alignment) and softer comfort layers (to help with secondary support and pressure relief) all at the same time.
[quote]I figure it’s a good investment both in fewer chiropractic bills down the road and in a good night’s rest - I’m also buying some proper blackout curtains and a Phillips “sunlight” alarm clock – and that if the mattress gives me five good years’ use, I’ll be really happy.
I really, sincerely appreciate your presence on this forum & the advice you’ve offered to me & to so many. I’ll do my best to offer some updates as I go along…[/quote]
I’m glad the site could help you. You certainly made a great quality choice for the budget range you are in … and congratulations on your new mattress 
I’m looking forward to any comments and feedback you have the chance to share when you receive it and have had the chance to sleep on it for a bit.
Phoenix