Right now I went with the E5bi due to it being the same tweeter and mid. The 4" bookshelf looked very tempting as it's gotten plenty of praise, but I didn't want to much a different sound.
I think the EMP's should be very solid for the price. They're +/- 2db for all the measurement whores, beautiful looking for all the aesthetic people, great price for the budget minded, etc etc. Every reviewer THAT HAS ACTUALLY HEARD THEM has liked them. The only reviewer I could find that has heard both the 814v and e55ti is the one I posted above. Your perception will likely be different than his as will mine, but still...with a 30-day trial period with nothing to lose..why not!
The RBH Signature SX 6300's are like $3,300+/pr and these look to share the same cabinet. Drivers are obviously different, but isn't there a decent amount of difference every time someone compares based on MSRP between 2 lines? EMP has stated there is definitely trickle down tech from RBH in the e55ti's. Same x-over pts for a start so maybe they're shooting for the same reproduction with different drivers. Who knows. Again, only the users ears will know which is better and then it's based on cost.