I recently purchased a Washburn WD27SCE. I've never really messed around with acoustic guitars much as I've only been able to borrow acoustic guitars in the past. Anyway, I was at guitar center looking at a bunch of D'Addario strings and I picked up a pick of the EXP coated 80/20 bronze strings (.12s) as the pack said they offer a brighter sound. They do, and they are great strings, but I think I want something deeper if that makes sense. I looked at all of the D'Addario strings and some of them said they offer a deeper sound, but I don't know how far down the spectrum I should go, and how much of a difference it is. I also don't know how much the actual guitar influences the sound. I don't want all the bright to go away, but I want a thicker sound.

I realize I may not be explaining what I want well enough, so I will do my best to clarify if needed.
Well sir, as someone who loves D'addario strings and that's all I use I'll tell ya what I got. I've tried almost all the varieties of their acoustic strings and I've settled at my favourite. I use The Phosphor Bronze Mediums (.013-.056). They claim to be right in the middle between bright and mellow tone, which may be what you're looking for. Here's a link
Epiphone Les Paul Studio Deluxe
Peavey VYPYR 30W

"There's nothing constant in the universe.
All ebb and flow, and every shape that's born,
bears in it's womb, the seeds of change".
I actually had those in my hand before i found the ones I am currently using. I shall try those out, thanks for the tip!
i was a big fan of elixir coated strings. last forever and have an awesome tone and feel