I thought about suggesting bard earlier.
Bard spell progression is slow. You will have all those spells anyway when you get Chameleon.
The CC/Inquisitor choice will give you 4 domains, 2 with domain powers you can choose. Some of them are really cool.
Drop the rogue. You get 3rd level spells if you go CC5, and will once again give you access to spells that you would never get otherwise, including (with domains) third level acane/crossclass spell list access to such gems as:
K 3 Clairaudience/Clairvoyance
Brd 3, Knowledge 3, Sor/Wiz 3: Hear /see at distance for 1 min./level.
O 3 Divination
Clr 4, Knowledge 4: Provides useful advice for specific, proposed action.
Ti 3 Haste
Brd 3, Sor/Wiz 3: One creature/level moves faster, +1 on attack
Tra 3 Fly:
Sor/Wiz 3, Travel 3 Subject flies at speed of 60 ft.
Tri 3 Nondetection:
Rgr 4, Sor/Wiz 3, Trickery 3 Hides subject from divination, scrying.
CC5/ Chameleon 1 might be the strongest spellcaster in E6. Certainly one of the strongest i can think of. You'll be casting 3rd level arcane and divine spells.
Consider the feat 'Spontaneous Domains'. Make sure it's the one that let's you cast your domain spell from any of your domains. Since your in E6 you get extra feats? You can also take 'Domain Spontaneity' which lets Spontaneously Convert to your domain of choice, which is nice when you have 4 domains and most the world only has 12-15 spells a day and you have 24
.
With this build you will have just a bit less Gather Info, but a ton more spells to do it for you