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Does any company produce colored metallic paints like the old (OLD!) GW ones?

Coat d'Arms produced the original citadel colour under license. THey still produce the same colours (with slight name changes), including the metallics.

Here's a link, but googling coat d'arms will find you many suppliers.
http://www.timecastmodels.co.uk/paints/paints.html

Reaper Master Series carries multiple metallic colors, and Vallejo sells an uncolored metallic base paint which you can color yourself using inks.

Tamiya and Gunze Sangyo also do coloured metallics. For a colour with more depth - 'candy' as opposed to mere metallic - put a layer of transparent colour over a silver base. You will also need to do this if you want a decent brush-on metallic red; the aluminium flakes in metallic paints notoriously give those a pinkish/greyish cast.

Back in the day I painted a whole necron army using an airbrush with Humbrolls enamel paints, namely a cobalt blue metal and the brightest possible silver I could find (the customer wanted me to replicate the look of terminator in the t2 movie poster)
I would say that overall enamel-based metallics look better than acrylics on large surfaces, if aplied flat.
Here is a pic with some destroyers from that army to show you what I mean

You can always mix the old GW ink wash with silver...