Well imho Navigators r totally out of range if u r on a budget, but if u can afford it, u will realise that it is worth every penny u paid for it since they r really masterpieces made with rare and expensive quality wood (totally pawnz Gibson Historics). But if u r looking for something that is friendlier to the wallet yet with quality close to Navigators, u cant go wrong with Edwards afterall they r all under the ESP umbrella, sister companies.
Personally i own a Edwards LP with the satin nitro finish (gives it a slight relic feel), fitted with SD 59' & JB, and beautiful close to book match flame top that are really nice for me in terms of tone, playability, and fit & finish (pawnz Gibson LP standards). It kinda feel & sound nicer and the neck is smooth instead of the familiar stickiness of the poly lacquer finished version. Total bang for buck, but u shld also try out the MIJ Epi if u can still find one since it is no longer in production, tried my friend's LP standard refitted with SD Alnico 2 pros and i must say........TONE HEAVEN as well!