Again depends on what you want. Seems that you want a lightsaber with lighted blade like the Force FX versions. The ones made from genuine parts most of the time are hilt only, and made for display purposes, because not too many would play with an original Graflex, MPP etc.
As I see it you have the following options (1-4 are licensed sabers):
1. go for the old Master Replicas (MR) ones (prices are quite high and on some will be higher due to the new SW movies hype) - great hilt sabers, come with elegant display cases, limited edition plaques, COAs (some sabers with t-track grips might start having sticky issues)
2. get the few EFX lightsabers made (again high prices on some) - similar to MR ones, very nice collectible pieces
3. there are a few old Icons sabers too - not too accurate, but still very nice pieces of prop replica history
4. go for some Force FX ones from MR, Hasbro etc. (some are very cool, pretty similar and accurate to the props like Vader sabers, others are less accurate like Obi ANH or Luke ROTJ - wide necks - again some sabers with t-track grips might start having sticky issues) - not sure about the newer versions
5. go fan made (Romans, Parks etc.) superb replicas, and in most cases more accurate than MR, Icons or EFX
6. go for the real deal (Graflex, MPP etc. conversions) - the most accurate option, expensive and rare, but the closest thing you can get to a screen used saber