Buy an Auditorium, OM (orchestra model), triple O (OOO) or double O (OO) style guitar. These guitars produce an even or balanced response across all six strings. This is preferable for finger picking and slide playing. Obviously we would not want the bass part of the alternating or monotonic bass style to overshadow and drown out the melody part on the treble strings. Dreadnoughts have a bass response that would need serious attenuation by heavily muting with the heel of the right hand. The guitars used in all the videos on this site are triple O (OOO) style guitars made by Gerard Gilet at Gilet Guitars in Sydney Australia.
http://www.giletguitars.com.au