With $3,000, you should be able to get pretty much everything you need. As others mentioned, check out ebay, craigslist and local used sporting goods stores and your newspaper for good deals.
I purchased many things from Play It Again Sports. If you are looking for good quality stuff, then you could do the following:
Body Solid or New York Barbell Power Rack with lat/row attachment (I highly recommend getting the lat/row attachment): $500-800
Ironmaster Adjustable Dumbbells with rack: Buy as part of a package to get a deal. See below.
Ironmaster Super Bench with attachments (get the ones you may need: leg ext/curl, dip bars, ab/decline, preacher curl, etc.).
You can get a package deal through Ironmaster.com that includes all of the attachments, the bench and the dumbbells for $800-900 depending on what stuff you get. I purchased package number four but had the chin bar taken out of the package. It cost me just a bit over $800 plus shipping. I LOVE THE IRONMASTER STUFF! One of the best purchases ever made. High quality, great feel!
Olympic Barbell Set with 300lbs: $129
Two 4’ x 6’ rubber mats (1/2" or 3/4"): ~$100
EZ Curl Bar: $20-$40
Triceps Rope attachment: $30
Triceps V-bar or straight bar (new or used): ~$20-$40
Med balls: $10-$100
Iron Woody Mini Bands (or buy a starter pack with various bands): $20-60
Xvest (40lbs): $169
Additional flat bench for dumbbell work or misc work: $30-100
Texas Power Bar (it’s always good to have an extra bar): $225
And you can always add more as needed! I have all of the above in addition to sandbags, boards for board pressing, jump rope, dragging sled, push-up bars, doorway chin-up bar, other bands, etc.