Jigsaw, Drill, Palm Sander, Random orbital sander - Go CHEAP. If you have a Menards home improvement store, they routinely (like every 3 months) have these items (except the random orbital) on sale for $15 with a $5 rebate = $10. Sometimes you can get them for as low as $8.49. Also check Harbor Freight you can get similar prices. The random orbital normally hits $20-$25 on sale at Menards. A RO sander is needed to more quickly eat away edges of particle board or MDF. A palm (non RO) works good for finishing off flat sides.
Router: Buy *good* quality. DO NOT BUY THE CHEAP CRAP at harbor frieght or off of ebay. They are utter trash. A router is a very precise instrument and is actually pretty deadly if they aren't assembled right. I have tried a couple cheap ones off of eBay, Harbor Frieght and Hominer Tools and they are almost too dangerous to use.... when they work. I wont go into all the problems I had with them, but suffice it to say, my fathers 1965-ish Sears router works hundreds of time better and is much more precise. Don't spend less than $50 on a router, but no need to spend more than $120 either. Shop around, and try them first.
By the way, DeWalt *IS* Black+Decker. B+D used to be a "high end" brand, but in the 70's when they started making home appliances (toasters, irons), and lowered their pricepoints, professional users balked at using "home crap" and started going with other brands like Makita, etc.. B+D then started putting out their same tools labeled under the DeWalt brand name. They're the same things, just with a different label.