As far as I recall, the C1000 gets neutral press around here, for the most part. As for recording both guitar and vocals, etc., I think your best bet is the combo suggested above of a used
AT4040 and some Naiant's for the guitar. The 4040 alone will most likely do well on vocals, and probably sound perfectly fine on the guitar as well (I have tracked my acoustic with just my Rode K2 and gotten great results).
Another poster also asked a good question - what are you recording into? You will need a mic preamp of some kind to power any of the condensers discussed, and I'd imagine some way of getting the sound into your computer, unless you already have an audio interface.
Also, if you really only wanted to go down the road of a single large0diaphragm condenser, I have recorded some songs with just that K2 mentioned above, placed about 2 feet away, halfway between the height of my mouth and the neck joint of the acoustic, and after some fine tuning of my own position, got nice, balanced results. The problem becomes that you are recording everything down through one mic, so you can't apply effects or processing to a single part of the equation (vocals only, guit only, etc). Of course, I did say you could get by with an LDC on acoustic alone, so you'd be all right either way. Plus, those naiant mics are like... 20-30 bucks, so I think a month or two down the line you'd be able to snag one or two and be well on your way.
Of course, this is all dependant on what you are recording into; if you are expecting to plug this mic directly into the Soundblaster card on your computer, this discussion is going to veer sharply in another direction