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