As for projector. Check out avsforum.com
Really you should use that forum for this whole thread.
The W1070 projector though is the most widely recommended projector.
There was a projector for $600 on slickdeals but I'm positive how good it is.
To get optimal performance out of a projector you need a room dedicated for that projector. Light control, dark walls/carpet, etc. All are important to getting the most out of it.
As for speakers/reviews. Speaker reviews are the least representative of actual performance of the speaker possible. Most popular speaker brands/kits have VERY high reviews (4-5 stars).
The thing with Speaker reviews is it's HIGHLY dependent on what the person is coming from. So if you're coming from TV Speakers to your first speaker set, you'll be happy no matter WHAT you get.
If I was to review each set of speakers as I got them I would have given them 5 stars. Each one has been an upgrade so each one has sounded AMAZING to my ears. If I was to go backwards though, I'd have a much different opinion.
The Z-5500 I first owned was decent bass but the small satelites just didn't have enough output for high volume listening if I wanted it to be accurate as well.
The Polk Monitor 70s with a Klipsch sub when I FIRST go tit was AMAZIGn. Never need to upgrade again. But having it for awhile nad now seeing better options, I can say that the SUB is dependent on the surface you put it on. So wood/solid was a lot different than Carpet. Doesn't extend as low as I want it to. Hit's great volume for the room though for music, but for HT it's lacking. Speakers sound dull compared to the B&Ws I have found now. The high end sounds much better on the B&W.
I'm sure I'll have a VASTLY different opinion again as I upgrade to a DIY kit of speakers. Because most people writing speaker reviews though are on their first/second set of a prebuilt system, it of course will be the best thing they've heard.
As for picking up speakers on Craigslist. If you can't listen first don't purchase. Pick something in which you KNOW EXACTLY what it's supposed to sound like. With detailed highs. Because a LOT of the time, people are selling their speakers because they don't like the sound anymore. Because they have broken the speaker (Usually blown tweeters). Even when I inherited the speakers I have now. The Bose were useless as they had blown tweeters and the B&W had 1 blown tweeter. Didn't even bother repairing the Bose, just wasn't worth it, the B&W I have though as they do sound good. I'd buy new preferably.
As for my thoughts on wireless. The last wireless system I setup really isn't truly "wireless". The back 2 speakers do receive their signal wirelessly but they need to be plugged into a wireless hub anyway. There are many ways to wire so that you can minimize wires showing.
See if you have a friend that can run wires through walls. That's the most elegant solution. After that, I'd just run it along the ceiling and use a cover to hide the speaker wire. In my living room and in my basement there is a rug infront of my TV that extends to the couch. I can also hide speaker wire/wires under that and run from the TV, under the rug, under the couch, and then hook up the speakers on a table behind the couch. A lot of living rooms are decorated with a table behind the couch. Usually holds some type of decorate. If you don't have one perfect, you don't have to contest with the lady to moving the decorations off and putting speakers on it. If you do and it has decorations well... good luck messing around with the room lol.