If I was you, I would buy the Danger Den Fat Boy or Bitspower 1/2" OD G1/4 barbs. Then use some 7/16" ID (or 5/8" OD) Masterkleer tubing (because its cheap) with 12-20mm worm clamps to clamp the tubing on to the barbs.
Believe me although it will hurt your fingers tightening the clamps, once they are on, the tubing is not going anywhere and you will not get any leaks. The only problem I found was that when I tightened the clamps, it sometimes loosened the barb from the component it was screwed into. You have to go around all the barbs with a spanner once you are done and make sure that the barbs are screwed tight (I went with half a turn past finger tight). Do not overtighten the barbs when they are screwed into acetal or acrylic components - you may crack the acetal / acrylic.
Also if you are using T-pieces or elbows, I wouldn't buy polypropelene, acetal, etc. (plastic) fittings. Again if you overtighten the worm clamps on to the tubing you may crack/crush the plastic. Spend a bit extra and buy copper or brass fittings. This means you can tighten the worm clamps as much as you like and you will not damage the fitting. Plus I think they look more professional.
Just my $0.02 worth.