My favorite nude is actually a nude-pink (which on me looks more natural than a straight nude) from NARS called Cruising. In terms of classic nudes, I also like Belle de Jour for a completely bare look: http://sephora.com/browse/product.jhtml?id=P2865&c
The new Bite Lip Shine in Prosecco is a gorgeous sheer nude (with which I have recently fallen in love): http://sephora.com/browse/product.jhtml?id=P283906
My favorite nude gloss is not available at Sephora, but if you have the chance to check out Chanel's Extrait de Gloss in the shade "Insouciance," it's completely worth it. It's expensive, but it's a long-lasting, perfect neutral nude.
A fantastic nude lipstick is Urban Decay Lipstick in the shade Sellout. Naked is another really pretty pinky-nude color. You can take a look at it here: http://www.sephora.com/browse/product.jhtml;jsessi
A great nude lipgloss is Urban Decay's Lip Junkie Lip Gloss in the shade Heavy. Wallflower is a really pretty nudish color, too. You can find them here: http://www.sephora.com/browse/product.jhtml?id=P26
Both of the products have worked great for me and I hope this helps you.