It really depends on 2 issues mostly
1. How much do you want to spend.
2. The colour & condition of your paint.
Q.1 A: The current favourite of mine is to use Klasse All in One followed by Klasse Sealant Glaze, topped off with P21S.
These 3 product will cost you about ?50 in total, (plus cloths & applicators), but for about ?13 you can get hold of Meguairs NXT wax, which gives amazing results too.
Q.2 A: Lighter colours are very hard to get a "Deep Shine" that has depth, the darker colours such as Black, Red, Blue & Anthracite are able to give off amazing deep shines. Saying that, with the right materials a reasonable depth of shine can be acheived with silver.
You may also want to go over the paint work first with an item called "Clay Bar", this is a soft clay like material which removes all the surface crud, which results in the paint work being very very smooth, thus giving a better shine.
Take a look at Serious Performance's web site, they have all the stuff I've spoke about & you get a 10% forum discount [Y]
I just had to take this pic yesterday after washing her,the shine realy impressed me & there was no new wax applied , just the Klasse & P21S I put on her a few weeks back...