I think it's important to continually work on expanding chord knowledge. The more ways you have to play a given chord, the less you have to "dive bomb" around the neck, and the hipper you sound. This is especially important for chord melody arrangements (which you say you like).
I'm no expert on the matter, but I do have a decent collection of voicings for a lot of different chord types, in different locations on the neck. These have been the result of (a) specific work assigned to me by instructors, (b) reading books on chordal approaches to jazz guitar, and (c) voicings I've either figured out myself, or "stumbled upon" when horsing around on the guitar. I continue to work on expanding that collection.
The one thing I found absolutely essential when I first started out was to figure out root and 2nd-inversion "spread" voicings for dom7, Maj7, min7, m7b5, and dim7 chords, on string collections 6-4-3-2, 5-4-3-2, 4-3-2-1. There's a pretty simple method of constructing these which I could spell out for you if you are interested.
Also, if you are more method-oriented, you may be interested in the Mickey Baker books. They enjoy pretty unanimous support. There is a whole huge thread on this site dedicated to those who are going through (or who have been through) this method.
http://www.jazzguitar.be/forum/getti...zz-guitar.html
Finally, you might want to take a look at some of Ted Greene's books (especially Chord Chemistry). That guy's material is simply amazing.