this makes things a lot easier, if you do it yourself with no help, you'll find yourself going back and doing a lot more adjustments than doing it with some help. I haven't had to make any adjustments to mine yet after getting help setting it up for the first time.Whatever you get make sure a knowledgeable person helps you get properly fitted, especially if it's a continous webbing harness. Too tight or too loose is not good. And make sure you get a crotch strap; it's the key to propper fit and ease of donning/doffing.
I would also look at the xDeep ZEOS as another high quality option (if you're not already overwhelmed with everything presented to you), it's in the same price range as the diverite and subgravity packages.