You might also consider getting a setup done on your full size acoustic to make it more playable. I just went through this with my Seagull S6 (see the guitar tech forum for all of the details if you are interested) and am amazed at how more playable my acoustic guitar is. I can play barre chords on it now with ease. An acoustic guitar (full size or otherwise) doesn't have to be hard to play!

It seems that acoustic guitars have a natural tendency to bend slightly at the neck joint over time. Very slight shift at this point translates to significant changes in string height. Some manufactures just set their guitars up with a higher action than necessary. The bridge saddle can be adjusted to compensate for this. At very little cost ($54, including regluing the nut and new Martin strings), I had this taken care of by a local shop. It's some of the best money I've spent!