I have both a Bubba Keg and a Bayou Classic Cypress ceramic, no experience with the BGE so I can't compare to that. But you won't go wrong with the Bubba Keg, it's an excellent grill. Smokes quite well at low n slow temps, does a great job at high temp searing also.
I had the Cypress first, then since the price on the BK was phenomenal at only $299 from Home Depot, I ordered it online and got free shipping, no sales tax so it was a no-brainer. I use both grills interchangeably, have turned out phenomenal meals on both. The slight advantage to the Keg is the dual grids giving me a bit more cooking surface than the Cypress when I need it. The BGE plate setter fits it perfectly and that's about the only addition I've had to make for indirect and/or pizza. InZone, the manufacturer, does now offer its own diffuser.
I'd see if you can get HD to discount it for you.
And drop by the Bubba Keg forums where there's a lot of good info and some fun folks to hang out with. I'm having an absolute blast with mine. Good luck in your decision.
-lunchman