thirded for dropping the Magnus. It hasn't changed in the decade that it has been out except for the speed controller and while I think the speed controller is really nice and the trigger is really nice, it is definitely not worth investing in a new one.
One important thing to think about with all of these things is the battery packs. If they don't use an off the shelf pack, you a. can't fly with it, but b. if it fails, you're going to be in for a gargantuan investment. A replacement Magnus battery right now is $2250 for 888wh. If you had a Piranha P2 and needed to replace all of the batteries *800wh vs 888, but close enough*, you're in for less than $700. A replacement for the new Genesis 2.1 with individual Panasonic 3.4ah cells would be around $350 since you only need to buy 70 cells.
Right now my money goes to a company that does not have proprietary batteries.
If you aren't doing long range cave diving and aren't in horrific flow, then the DiveX Black tip gets my money. It uses standard Dewalt batteries, and if you get the expensive batteries you are in for less than $2500. $3k and you get a spare set of batteries. It has about half the range of the P2 or Genesis 2.1, but unless you need that range on a single dive I'd have a hard time recommending you buy a nearly $8k dpv.