Well, everyone else has contributed here, so I may as well jump in too.

My "sweetheart" guitar is a custom-made Breedlove C25/k(Koa) that sounds and plays as beautiful as it looks. It was purchased as a used instrument at a time when no more guitars were needed; but, it just couldn't be passed up - even traded in a Martin D28 as part of the deal.

I also have a Takamine Santa Fe (cedar top) which gets a bunch of stage time; and, a Takamine 2001 Limited Edition which we call the "Costeau" - supposedly some of the money from the original sale of the instrument(s) went to the Costeau Society.   

My final guitar is a classical model Takamine "Hirade" and although it would be shunned by most classical players - I'm not a classical player and it's a joy to play it when the mood strikes for a softer, more delicate sound. Cheers.