David wrote:

Hello,
I am looking to buy some speakers (2.1) for my new desktop in the
$100-$150(maybe $200) range.

I'd get a small amplifier and a pair of real 2-way bookshelf speakers.
That "sub" on the typical 2.1 system is really the 5-6 inch woofer
that you should have in each speaker. AND, the crossover point
is so high so as to still be directional. Ie - you can plainly
tell there's a third speaker in the room. A proper sub is
nearly impossible to sonicaly locate as it doesn't do much
above 50-60hz.

That said - um...
Used amplifier. Really doesn't matter. I like 10 yr old Kenwood
Dolby Digital models myself as they are good 2-channel amps
and everyone is tossing them away to get the new DTS models.
$50 should easily get you one used.

That leaves a fair chunk for speakers. Obviously used if you
can manage it. Tannoy M and MX are good, Mirage and Athena
are as well, and so are Paradigm. Other brands exist, but
these four manufacturers make consistently good budget speakers
in addition ot their higher-end model lines.

Oh - one more choice I recommend:
If you already have an amplifier, Magnepan makes a small
pair of planar speakers for $300. Gorgeous sound but
not much bass. You'll eventually need a sub to go with
these, but the top-end is stunning compared to anything
under $1000 that you've heard.