Generally, audiophile quality vinyl is somewhat expensive and many times limited editions as they only press a small amount to preserve quality through a given LP stamper. Most audiophile quality vinyl is made with virgin vinyl pressed at 180 grams or 200 grams.
Here are some LP's that I own and routinely use to fine tune and upgrade my system if needed:
Pink Floyd - Dark Side of the Moon (MFSL)
Stevie Ray Vaughan and Double Trouble - Couldn't Stand The Weather
Holly Cole - Temptation
ANY SHEFFIELD LABS Direct To Disc recordings (Harry James, Thelma Houston, Dave Grusin, Lincoln Mayorga)
Led Zeppelin Classic Records 200g pressings (I have Physical Graffiti, House of the Holy, Earlier Days, Latter Days and 6LP Box set called Mothership)
Ry Cooder, VM Bhatt - Meeting By The River 180 gram 45 RPM 2 LP set.
Rickie Lee Jones - Pop Pop 180g vinyl
Neil Young - Live at Massey Hall
I have to add these Jazz legendary LPs to the list as well:
Miles Davis - Kind of Blue
John Coltrane - Blue Train
- These are just at the top of my head. I have amassed quite a collection and use it many times to just fine tune stuff. I love tube rolling and you can really play with the sound signature of the system that way.
Actually, here is a website you can use to determine what you would like. Michael Fermer is a very well respected Analog music reviewer and has his own website. I'm a regular reader and it definitely helps before you plop down $40 to $100 on LPs:
musicangle.com - By Michael Fremer -- Music * Reviews * Audio * Sound * Vinyl...
Check out what is in heavy rotation for him and he has it separated by months.