Gel Pens

Hi all you wonderful stampers! Question -
what is the best brand of gel pens to get
and while were on subject, how do you
store yours to keep ink flowing. I've tried
both horizontal or vertical and still get
no ink when I want it. The pastel/white
pens seem to be the worst - am getting
ticked off spending money to replace only
to find the next one is no better than the
last! Any help or suggestions would be
greatly appreciated - TIA.
Sandy