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Armor:

5 pieces of Firebirds and RoRG, along with Leoric's Crown is basically all you really need for armor. There are a couple options for bracers and belts, however. For belts, if you're going to use Boon of the Hoarder, use a goldwrap, as that will make you pretty much invincible most of the time. If you aren't using Boon of the Hoarder, The Witching Hour will give you the most damage. For bracers, Strongarms will give you the most damage, because enemies will take 30% more after being hit by your black hole, but if you're looking for pure speed, Warzechian Armguards will be best. Lacunis are a decent option too. Now, if you have Magefists, you can use those instead of Cindercoat, and just use Firebirds chest armor. There is really no difference between Cindercoat and Magefist in this case, because we don't need the RCR from Cindercoat. So whichever you have, or whichever is rolled best, you can go with that.

Weapons/offhand:

Wand of Woh is the obvious only choice here, as we're using Explosive Blast as our main source of damage. For the offhand, you pretty much have to go for Firebird's Eye. You could go for Magic Missile - Conflagrate and use Mirrorball as an offhand, but then you'd have to give up Cindercoat, which kinda sucks...

Gems:

Since Explosive Blast does all of its damage in a 12yrd radius, and Spectral Blade does its damage in a 15yrd radius, they will both be in range of the Bane of the Trapped rank 25 aura, so they will both benefit from the damage (roughly 25% multiplicative damage is really strong!), so Bane of the Trapped is an obvious choice. For other gems, Boon of the Hoarder will not only give you tons of gold and more movement speed (with the rank 25 bonus), but it will also make you virtually invincible when using Goldwrap, so that's another pretty obvious choice. For the last gem, it's pretty arbitrary, you can use whatever is best for you. I'm not sure what would be the definite best, but for now, Wreath of Lightning works for me.

Paragon Priorities

Pretty standard, get 25% movement speed across gear/paragon, then put the rest into Int., for offense, max CDR first, as we want a lot of CDR to try and keep 100% uptime on Explosive Blast. After that, max crit chance or crit damage, whichever one is more important, then proceed to max the other if you have enough points. Attack speed really doesn't benefit this build much. Defensive, since we're an int class, we'll benefit more from Amor than All-res, so max that first. Once armor is maxed, go all-res, the either Life or Life regen, depending on what would be more useful to you. Utility, max area damage because (I'm pretty sure) explosive blast should benefit from it, and then life on hit. The rest is kinda useless for this build so just do whatever.