Oh man, this is all too hard : (
Oz, it's not hard at all. Seriously.
I'll save you some time..... Ask someone who's experience is as vast in as many areas that have been pointed out, as possible.
The beauty is, here on AudioCircle, you have it
all.
You want to learn about room acoustics? Go look in the Acoustics Circle. AC has some of the best in the business.
Speakers? Well, you're in the right circle, but there are others as well.
Front end components? Some of the best in the business are here.
Amps? Ditto.
Cables? Ditto.
And vendors here that are as honest as the day is long, with
great advice on how best to spend your money, and even greater support when you do.
If you like to read, you can become a seriously well educated audio nut within a short period of time.
And I dont know, I would love to hear a set of OB-7's and a Servo sub driven off the cheapest CD receiver I could get my hands on!
That speaker choice is a great one. I had both the OB-5's and OB-7's for a while, with GR's PR sub. Fantastic combo. I have a pair of the GR servo free air subs here, but haven't had the time to build them out.

However, I will tell you that you cannot be so lax with your source components. At RMAF 2007, Danny was to have a super modded transport from another vendor on loan to drive his system which consisted of his super modded DAC, Dodd battery powered preamp, over the top custom Dodd tube monoblocs that run 130 watts per side in Class A, run on a Dodd power conditioning unit. Cabling was second to none. Room heavily treated. Speakers were LS-6 line arrays.
A world class system.
The modded transport was a no show.
An out of the box budget CD player was offered as a substitute and used as a transport
only.
The sound? You could just about do better with a $500.00 Best Buy home theater in a box setup. Ok, maybe not better, but not much worse.
Luckily, a local friend of Danny's saved the day and loaned him an older stable platter CD player. It was placed in as a
transport only, and showed all of us how significant a poorly designed component
can be.
You cannot be lax on
any component. Like an underpowered amp. Sending a clipped signal to a speaker is R E A L L Y bad....
Cheers