This is the second time I've recommended the following today (the other on Detailing World).

Rather than go with the Megs 3 step system, you'll get far better and WAY longer lasting results by going with a base layer of Autoglym Super Res (use it 'properly' though ), followed by 2 layers of any of the Collinite waxes (467s, 845 or 915).

Still 3 stages to do exactly the same, but so much better results, and the last 'wax' one of the megs system is quite well known for being one of the least durable carnauba based waxes around, so I figure for the same amount of effort you might as well be using something decent that's going to last, and the Collinite waxes are the daddies when it comes durability.

Another alternative after the AG Super Res is Finish Kare's 1000p high temp wax (which is a sealant really, not a natural wax). Getting some rave reviews across the detailing community.