If you need to treat the instrument as a band member as well as a friend consider the steel strings twice. Although I'm assured that nylon strings can do everything metal strings do I don't fully believe it. I think metal strings are more easily amplified (if that is a concern?) and would probably stand up to slide work more vigorously.

If amplification is an issue I really suggest you consider a miked acoustic guitar. If only because I've heard some horror stories about a badly installed mike in a favourite instrument and about temporary mikes falling out on stage. Best it be done before you buy it so you know it works and you're happy with it.

Still, all of this is technical detail next to your relationship with the instrument. If the instrument doesn't make up your mind for you that might not be the right instrument for you. Sounds flaky, but if you dont like the instrument (even the colour or wheight!) its one more excuse not to practice that you dont need. I'm sure you know this (based on your other instruments) but sometimes we convince ourselves that "its a good deal for a guitar or ______" and forget the personal connection that we need to make the instrument a joy \ useful.

bo