I have a 2005 Martin custom 000CX1E. This is actually one of the cheaper Martins but all my musician friends say the sound and tone is AMAZING! I had the action adjusted by a guitar tech and it plays FABULOUS!
I play a tanglewood, im not sure what model it is. I went to about six different shops playing nearly every semi-acoustic that they had in the shop. when i picked up the guitar i have now i knew it was the one i wanted. i use elixier strings 12 gauge. they are expencive but well worth it. last for ages and can make any guitar sound really sweet.
I have a Samick Greg Bennett Signature Series (MJV-10SE), Electric/acoustic. I like Dean Markley's Blue Steel LT strings, but occassionally use Martin or D'Addario strings. It has a narrowed neck (I'm on the petite side) that makes it alot easier for me to play than my dad's '75 Yamaha. My Samick was a gift from my parents, so it'll always be my first choice. I also have an old Peavey Patriot electric guitar.
My last guitar was an Ovation Celebrity shallowback. Owned and played it since 1988ish and never wanted anything else until I started playing at churcha lot and the sound guy could never get me loud enoug in the mix. The passive pickups were not getting the job done - and it was developing an uncorrectable bow in the neck.
My guitar tech recommended the Dean Performer SE. You don't need a d-box (a mic cable will plug right into it) or a tuner (it's built in) with this baby. Cost about $400 but plays/sounds as good as anythign less than a grand. FYI, if you want a case to fit it, don't buy a Dean case. Gator makes one (the 'dreadnaught' I think) that fits it perfect.
My next guitar will be a variax. The tech nerd in me loves it, and it lets me have (sorta) hundreds of guitars for the cost of one. Oh - but that's not an acoustic so - never mind...