Link is working for me, the are carnegie csb1's
When I buy a system, I go for the best value, sure a pair of sonus bookshelfs at $25K with a pair of JL audio subs at $20K and a mcintosch pre and pair of mono blocks will probably sound really good, but at $80K its unrealistic for most people... So I find speakers that perform well beyond their price range and will do what I want them to do... When you talk about an "audiophile" system, it can range from a hundred dollars to hundreds of thousands {hence why this is all just babble until we know what you want to spend}...
Anyway the csb1's are on sale rite now for $399, this is a bookshelf speaker that performs well for its original price of almost $900, so at $400 it an easy decision, I own a pair, they are warm, defined, and very accurate...
Now crossing the lows out to a subwoofer will do a few things, 1 it will concentrate your amplifiers power to reproducing the mids and highs through your bookshelfs, this will give you more dynamic range, since your lows use a lot of power. 2 most bookshelfs are thin in the low end, because of the small enclosure, small drivers, ect {but you get less cabinet resonance and a tighter sound from bookshelfs vs towers or larger speakers}, 3 you will get a ton of low range output out of a decent subwoofer, and if you get a small sealed unit that is fast and tight the bass will remain musical and melt into what your bookshelfs are producing much better....
So a good deal on a small, fast, sealed musical , subwoofer is that svs unit for $450 {already a bargain at $500 so 450 is even better}....
Now for a receiver, I like to keep my music systems as direct as possible, depending on your inputs, a dac with a separate amp will normally give you more power, and better digital to analog conversions, if done rite... A receiver will work for less money, you may or may not hear a difference...
Here is one more thought, you can n ot just buy what someone says to buy, what sounds good to me may sound terrible to you. I like warm, neutral, flat sounding speakers with a LOT of bass, I don't like bright highs, that some others enjoy because they sometimes make a system sound very clear... You may like what we don't or vs versa... You need to demo and listen for yourself and buy what you like.. Use our recommendations as a starting point, but that's all it is...