I'd recommend starting with some highly rated (by lots of people) albums... see what ya like
Pixies (Doolittle or Best of) - classic guitar indie
Pavement (Slanted & Enchanted) - classic guitar indie
Interpol (Turn on the Bright Lights) - dark guitar indie
Radiohead (Ok Computer) - guitar indie
Grandaddy - (Sumday) - indie space pop
The Postal Service (Give Up) - indielectronica
(ok - grandaddy I slipped into here... but they are great! My fav. band the last few months...)