My favourite topcoat of all time is by Seche Vite. It's absolutely amazing and gives a really nice shine to your nails. The downsides are that it's about $7 a bottle, and once the bottle gets to about half, it gets very very thick and hard to use. And I could not justify using it. UNTIL NOW.
I'm not sure how much the restorer costs, but even without taking it into consideration, thats 9 little bottles of topcoat for the price of less than 3. A fantabulous deal.
Also. The restorer comes in handy because when your bottle starts to get thick and goopy, you add a couple drops in, and it is back to the original consistency. The Seche Vite Restorer also works on regular nail polishes that have been around a little too long.
And here are some the the manicures I have done with my new arsenal of topcoats.
I know. I'm still working on it. I need some more practice before I'm the nail art queen.