I had the same budget.
Went with the Cortech Impulse II jacket and Apex pants from New Enough (bought a bunch of things from them, good people to deal with). Those zip together as a two-piece suit.
Note: For track use, take the hip armor outta the pants. Makes throwing a leg out difficult with it in. I didn't figure that out until the afternoon sessions. Duh.
Knee sliders, $19 from
Indysuperbikes.com
Best price I found anywhere. I got the hard compound - note that the photo on the page has 'em backward. The hard compound sliders are the ones at the bottom with the lizard.

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"I hate to advocate drugs, alcohol, violence, or insanity to anyone, but they've always worked for me."
— HST