maybelline volum' express. it's my favorite and I currently have 10 different mascaras ranging from covergirl to guerlain. it always goes on smooth but adds a lot of volume and keeps it curly (get the waterproof).
here's my suggestion on how to get great lashes:
curl your lashes using this: link it may seem cheap, but you can start at the base of your lashes then kind of... swoosh (?) it up along the length of your lash (like curling a ribbon) and it looks amazing. I use them more often than the original eye lash curlers.
use one coat of covergirl lashblast length in a brown link to kind of prime it after you curl your lashes
use one coat of maybelline volum' express waterproof link in a black/brown (depending on your preference)
use your hairdryer to add additional heat to this heated curler link and use it to curl your lashes an additional time except after your mascara is on. doing this will help "activate" the mascara because of the ingredients used to make it waterproof.
if this doesn't work for you, I don't know what will :P :)
Maybelline turbo volume express but I bought this sweet one from the chemist for a fiver called mega volume by constance carroll that was surprisingly nice. No clumping and thicker. I can't wear it much though because it makes my lashes too long and I wear glasses most of the time :( hmph
I use maybelline falseies mascara I notice that a lot of mascaras they tend to be clumpy but this one comes out nice a smooth also I always apply a genrouse amount to make my lashes look fuller and longer, but I also apply a little less when I want to create a flirty look just to fan them out a little .
I use a clear mascara made by Covergirl...sounds pointless yes but my eyelashes are naturally long...really really long. This mascara I use just neatens them up and makes them look even longer and fuller!