And you play bass, and worries about reverb? C'mon is this even a serious thread, and not a put on?
The more bass and more church you play in, the less reverb you need. Any! Trust me on this one.
The only reverb I've heard that can be used for any bass - which means bass frequencies for sound effects such as explosions and stuff - is the small German under-the-radar company Quantec, who makes the Quantec Room Simulator rack effect unit. And it's really something you can't buy if you're not involved into any high end Hollywood blockbuster moviemaking, but it'll sure turn your bedroom into a church, if you want, but impossible to take out and play live with. Especially regarding the cost. You can't afford it. They're like 3 K plus dollars, and then you need a high end AD/DA unit to at almost the same price... they don't work wihtout them.
Trust me, you'd be better off without any reverb at all. It's not being snarky, it's a serious advice.
Reverb on bass is awesome, especially in a worship setting where you can play drones. Of course you wouldn't use reverb when playing in a typical scenario, you want to be tight and articulate, not smeary and ethereal. If you're playing solo, or with a very empty mix, reverb can fill things out very nicely.
To the OP: I played the Bluesky, it's pretty freakin good. Never played the IE but it looks and sounds amazing too. It really comes down to the subtle features, as both have some sort of EQ on the reverb, expression controls, etc. Another poster mentioned it, but the SA Ventris may be worth the wait. It looks very promising.