Depends upon what you feel you will need. Things to consider:
Battery extension cap - Allows you to increase the time between battery changes from 11 hours to 20 hours by using the next size up battery. This comes at the expense of increasing the length of the Provari by almost 1 inch. There are other "after market" options for this though. Provape only offers an extension cap to go up by one battery size. There are others like the Tatroe base & sleeve to use an 18650 battery and have a wide base which helps keep the Provari from tipping over on a desk, particularly helpful if using a heavier/bulkier
juice delivery
device.
One year additional warranty - May give you increased peace of mind to have this, but I didn't bother. The Provari has such a good track record for dependability and durability, the chances you will use this are slim. Especially since Provape will continue to service your Provari even after the warranty expires (at your costs for repair and shipping).
Blue or green LED display - default color is red; many owners say that the blue and green are sharper and easier on the eyes; the red is bright enough to see in bright sunlight. I have both blue and green, and prefer the green.
Noaloxx - You'll need this eventually; either buy it now from Provape or get it from your local hardware (Home Depot or Lowes). This is applied to the threads on the battery cap to prevent oxidation from occuring (prevents locking up of the threading and interference of the electrical circuit from oxidation buildup.) Also keeps the threads "buttery smooth".
* Personally I would not buy anything else from Provape. Batteries, charger, battery cases, drip tips,
tanks, cartomizers, atty's, etc can be purchased elsewhere for a cheaper price and better quality. However, purchasing from Provape with the free shipping with any order over $100 may neglect money saved purchasing these supplies elsewhere and their shipping costs. Regardless, I purchase all my chargers and batteries from RTD Vapor
RTD Vapor AW Batteries
Only AW IMR batteries. 18350 in default form; 18490 with the extension cap.
Don't skimp on getting quality batteries or a good charger. You'll be glad you didn't in the long run.