I've got a few different brands, some OPI and essie, but really my favourite is the $2 Ulta3 you get from the chemists. This stuff rivals the best of them, and you can get 10 bottles for the price of one OPI.
This is my latest haul. I was originally not going to buy more nail polish till I'd used all the ones I already have at least once, but I needed a little pick me up on my work break. Why not spend not much money on lots of polish eh? I actually have a list of colours I'm allowed to buy (yes really) but these polishes are in bins, so it's a bit hard to be picky about what you're after. Turns out only one of the colours was on my list. Whoops. But I am happy with them all.
These photos really don't show the colours (and I am far too lazy to do swatches). Twilight fever is a sparkly purple with grey tones, and wild berry is grey with blue tones. Watermelon and party shoes are just nice pinks.
L-R: Rimmel Pop!, OPI Rainbow Connection, The one that got away, Stranger Tides, Italian Love Affair, and Ulta3 Earl Grey.
I think I'll be trying wild berry with either watermelon or Essie's fear or desire next time I do my nails. I also bought some Thin Lizzy 6 in 1 while I was at the chemist. I was with my friend paying for the polish when she spotted it (she's a kiwi) and because you got 2 powders, 2 eyeliners (half black+half brown), 2 lipglosses and 2 brushes for $50, we thought we may as well try it. The colour seems too dark for me but I really don't know if I'm doing it right, haha. The lipgloss is super sticky (I haven't used gloss in years though so I have nothing to compare it too), but the eyeliner and brush are decent.