Here's a question. Does primer really help and how exactly? I got the smashbox one, still unopened:)
I swear by primer, I won't apply make up without it now. It helps glide make up on so much better.
Smashbox primer is brilliant, but I usually only pick it up in duty free as they tend to do really good offers. I think its 2 for ?40 or something like that - it's a really good deal.
Mac primer is also good, but I wouldn't go out of my way to buy it. If I was gifted it, I'd be appreciative but I'd be more inclined to buy SB.
W7 do a really good primer that isn't entirely dissimilar to SB - I can only find it online, but by comparison its ?5 including P&P. I use that for everyday wear.
NYX primer is also pretty good, but I wouldn't recommend the HD one (its in a white tube). It is a decent primer, but my skin has been awful since I've been using it.
Urban Decay's eyeshadow primer is also pretty amazing as well, but again, I couldn't justify it for everyday wear because of the price. It does make eye colours look amazing though.