For eyeshadow I don't think you can beat Benefit and Mac, great colours, blends well and stays on forever.
Rimmel liquid eyeliner is am zing, if you put it on in April you could probably still be wearing it in June if you didn't take it off
Rimmel also do a great range of lipstick colours. For pencil liner again you can't beat Benefit (IMO) but I also find Collection 2000 liners really good.
Boots no 7 is a good option if your on a bit of a budget as well, I really like the face powder (but love clinique if I'm feeling flush)
For mascara I don't think you can beat L'oreal (all of their mascaras are good). I find a lot of mascaras by other brands don't give enough length, even the more expensive ones.
I always use Clinique/ Estee Lauder foundation as you tend to only need a bit and it lasts forever.
With regards nail varnish I've never had any that didn't chip within a day or 2 (I must have rubbish nails?
) so I don't bother with expensive brands, Boots 17 do some really fab nail varnish colours.
Oh make up, how I love thee, I swear my heartrate gains an extra 20 beats per minute whenever I see the Benefit counter
Oh and I can also really recommend the Mac makeovers Krystal mentioned. I've never had one but my friend did for her birthday recently and she looked amazing afterwards, I'm definately going to give it a go next time I have a special occasion coming up!