Microphone for quiet instruments

[allends]

Hello Gear Gurus,I'm looking to purchase a budget microphone for $600 or less that would have some unique specs for my situation. I'm presently recording my sitar - a rather quiet instrument - in a home studio with a relatively quite PC that sits only about 4-5 feet from the mic. I know, the room setup isn't ideal but that's what I've got to work with.My goal is to choose a decent condenser mic with low self noise that will focus on the instrument and reject as much room noise as possible. With my present omni-directional dynamic mic I'm getting low gain from the instrument and can hear the PC hardrive in the mix. It wouldn't take much to improve this situation but since I'm shopping I'm asking for any advice I can get.Feel free to jump in and offer any advice on mic purchasing even if you don't have the slightest idea how to mic a sitar - the topic is a bit out there .Here's a quick list of mics that caught my novice eye:AKG C 1000 SAKG C 451 BRode NT1-AThanks,-Allen