The thicker the vinyl, the better the sound. Most older "floppy" records are 80 grams. Many modern records are 150 grams. Thicker records also allow for better bass response, as low frequencies require deeper grooves. Special-edition and audiophile records are often split into 2 or 3-disc sets of 180 gram records.
To balance customer affordability with high quality sound, we opted for 1 two-sided 180 gram record, leaving room in the budget and jacket for our custom 24 x 36" lyric map.