Best CD of Rachmaninoff's Third Piano C

Ashkenazy is a good all around choice no one will argue with. As Kitch29 says get the Previn/Decca series from the 1970s, you can get budget double disc with all four concertos. Ashkenazy also has 1980s set with Haitink/Decca,
and although performances are good the early digital sound quality is inferior to Previn set. Also pass on the Ashkenazy "decca legends" 2/3 cocerto disc from the 1960s, I was dissapointed with sound here.

I think the Wild/Horenstein complete set on Chandos budget line is also right near the top, very good sound and Earl Wild has much panache, will not dissappoint.

My top choice for Rach 3rd piano concerto is Agerich/Chailly
on Phillips label (sorry full price CD) a live recording that is spectacular combined with an equally great performance of Tchaikovsky piano concerto 1 with Kondrashin. This is a disc that every classical musical lover must own!

Just saw that the Agerich/Chailly Rach PC 3 on Phillips is
now available in their new remastered "50 greatest" series
at mid price, however the coupling is not as good as full price original. But if you only want Rach PC 3 this is great buy. I am also looking to replace my old Kovacevich/Davis Greig PC 1 with remastered "50 greatest"
version but none of my sources have it yet.

I did recently replace my Davis/CBO Berlioz Sym. Fantasique,
with new Phillips "50 greatest" version and was impressed by remastered sound. Fortunately these are mid price, but I am afraid this is not the last CD I will upgrade!

Kitch, no the remastered Davis/CBO Berlioz Sym Fantastique is a single disc, part of new "50 greatest" series just released at mid price. Contains only Sym Fantastique like original release, no additional music.

The disc you refer to is an older Phillips "duo" release.
The "50 greatest" series was just released and uses SOTA 24/96 remastering which at least in this case delivers as advertised.

I saw several places on the internet where you can order the
complete Rach PC 1-4 Ashkenazy/Previn/Decca for under $14
as a budget priced "Decca Double" release. Life is good.