Arctic. If you like the Original Trilogy shade of blue, go with Arctic. I've only seen photos, but it looks spot on to the original color.
of course, I'm a HUGE OT fan, so I could be a TAD bit biased here. LOL But yes, you want it to look like Luke's in ANH, then you probably want Arctic. I have a Guardian SI, and I can tell you it's a great saber... but it doesn't look like the ANH blue by any means.