HD Music downloads vs CD purchases.


I thought it would make sense to download music in Hi Rez since my CD collection is quite small. I have an IPOD and an iBook G4. Thought of getting a Wadia dock and an external DAC as well to play on my home audio system.
After doing some research, i realized that the few HD music download sites (HDTracks, Music Giants, ITRAX) have very, VERY limited selection of titles available compared to the mass CD market. Actually, all the titles i wanted none of the above have them. I have nearly 2000 vinyl's but some titles i can only get on CD's.

Question is: should i keep my CD player and build on to what i already have.
I do not quite understand what "PC Audio" is intended for since there is almost nothing available to download in HD. Is it (PC Audio) essentially "designed" to rip a CD collection in AIFF, FLACC, WAV, onto a hard drive and do away with hundreds of plastic cases. That i would understand.
Thank You

smoffatt
Just a point of information. Porcupine Tree, my current faveorite rock band has some Hi Rez downloads available on their website. They sound excellent. I believe the name of their website is Burning Shed.
There's the rub. Hopefully, for those who are audiophiles, sometime in the future you will find the music you like in hi-rez.

I have the same problem. Very few titles are available. You can always hope.
for now, yes. If/when more popular titles are available as a hi-rez download, then there will be more to it than a storage/selection/ergonomic issue (w a high end DAC you will get superior reproduction, but not likely from an iPod unless you get one of the new hi-end docks)