Benson,
Don't know if you are still looking or not. I recently went through the dillema you are facing. Went to my local guitar dealer that carried the largest selection and tried as many as I could. After several hours I was pretty sure that Martin had the sound and feel I was looking for, then started shopping for the best deal. Found a local shop that carried many good second hand guitars, and bought a lovely 1999 Martin D-35 for about 2/3 price of new, and as with most guitars it sounds better with age. My advice is get the best you can afford and what fits your ear / hands / style.
Oh yea - about the humidity thing. Martin web site says 50% RH is ideal. So before you go crazy about humidity buy a cheap hygrometer from you local hardware store (they often have temp and humidty together in a cheap plactic cover of some sort) and see what you place is at. I live in Canada, its very cold in the winter, and my house is exactly at 50% humidty - so I just don't bother with the hassle of the gizmos or sponges or other stuff.