If your budget for speakers is $200, then you should just spend $200 on the front speakers. Decent speaker wire is cheap as hell, especially if you buy it on eBay. Sound deadening is important, I would at least do the front doors.
Tools, I would recommend a DMM, cordless soldering iron (the battery powered Hako I bought on amazon works quite well), heat shrink tubing is much nicer and more durable than electrical tape, and a decent wire crimping/striping tool. When doing car audio work I have all of these things in a bag with with me, along with a sharp pocket knife and a butane lighter for the heat shrink.