I recommend the Da Buddha hands down. The DBV is a is a top quality vaporizer made by the same people who make the Silver Surfer Vaporizer. I was so impressed with the quality and efficiency of the products that this company offers that I started a partnership with a local head shop to start carrying them in their store, along with a few other products. I've dropped my Silver Surfer on the floor a couple times and nothing has ever happened to it. That thing is an absolute tank, and the Da Buddha is basically its little brother.
If you are interested in picking up a DBV lemme know, and I can get you a damn good deal on one through the store. Just go to THE VISE ONLINE - Home and shoot me an email and I know you'd be a happy camper

I looked into the Purple Days a bit and it seems to have an almost cult following behind it. I didn't find any sour reviews, so I imagine this might explain the 9+ week waitlist, unless you manage to snag one on eBay. It may be something worth looking into though.

Another product I would consider looking into, is the Vapolution. I don't know a crazy amount of info about it, but I remember it had some pretty good reviews for the price range it covered.

Good luck in making your decision,
Taylor