Well, the base list is one that I got from Cliffy on Facebook and modified it slightly to my own liking, even though he suggested playing a mono-red version with Faithless Looting and Overmaster, saying that it was noticeably better. I, on the other hand, really like the consistency brought by Brainstorm and Ponder.
I've liked the 2 basics a lot so far. It allows you to play a more stable long-game, which is an aspect I enjoyed from playing ANT and DDFT in the past. I haven't tried Mana Monkeys yet, but I've been seeing them pop up. It's something I've been meaning to try out.
The 2nd Fiery Confluence has been great. I generally board one in for games 2-3, just so I have a kill condition if BW gets Surgicalled.
I also really like having the option to kill off a single Bonus Round trigger with a BW and a low storm count (given that you have enough mana to cast both Confluences).
I haven't felt that SB space is tight (yet). The Tendrils is probably the least useful card, but I will say it feels wrong to play a storm deck without it. I already feel that the Pyroblast is a flex slot. I will say that I'd like to try to fit in a couple of Surgicals in the board, or even a Silent Gravestone or two.
Something I've been meaning to try out is an Intuition in the main. My problem is that I don't know what to cut for it.
Let me know if you end up coming up with a design. I'd be interested.
Although, I might pick up some of these, just to represent the stack, in the meantime:
https://static.wixstatic.com/media/6...,q_90/file.jpg