When it comes to brands, I don't discriminate. I have anywhere from Wet & Wild to Chanel. Even though they are pricey, my favorites are my Chanels. Not just because of the color (they are reds), but because I just really like their polishes. Chanel polishes are very smooth and creamy, and they last so long on my nails.
Chanel polish is pricey, about $26.00, but given how long they last on my nails I find it to be worth it. They do tend to thicken in the bottle, so you do have to use them fast. If you do want to splurge I would recommend getting a color that you are going to want to wear over and over again and not necessarily a "trendy" color, since you probably won't use up the entire bottle.
Since I love red polish #487, Rouge Fatale, was a no brainer for me. It a great blue red.
Although the polish does thicken, I have had this color since Christmas of 2010 and applied it with no issues today. I have had it thinned at the nail salon, which is way it still works well. Sadly the color is no longer available, but it is similar to #455, Lotus Rouge, although Lotus Rouge has less brown and a little more blue to the red.
#487, Rouge Fatale, can still be found on Amazon.com