[choof]

starting to play this again
wish i had the money to pick up the xpac but i'm broke

fortunately i found a post on stackexchange that listed everything i miss out on for not having the xpac.

The Crusader class. You will be limited to the same 5 classes that originally launched.
Act 5. The story will end with Diablo.
The Mystic. You will only be able to use the Jeweler and Blacksmith. The mystic allows you to customize ("Transmogrify") the visual style of the armor and weapons, and enchant items (change a single stat on an item to another).
Level 70. You will not be able to get past level 60. This means you will also not be able to get artisans higher than level 10.
Adventure Mode. You will be limited to the story mode. You will not be able to do bounties or Nephalem Rifts.
Blood Shards. You cannot collect blood shards or gamble.
New Gems: Imperial gems and higher can be dropped / combined only with the expansion. This also implies you can and will have to increase your Jeweler and Blacksmith artisan level to 12.
New Legendary items: Some new legendary items will only drop on level 70. And some even only on Torment difficulty.

all of these don't matter that much to me, at least currently.

Choof#1397