Aren't we at $7600/prem and $9500/LE averages these days? The last LE I bought was an SWLE at $8500 but I had heard it went up from there when I almost bought an AIQLE.
Stern/PBL Shaker - $100
HD glass - I put PDI in at $300
Exterior Side armor - $60 - $75 for extended rails
Interior Side Art - $75 - $100
Powder coat $250 - $300 for a nice 2 stage "illusion" color (sometimes better than stock LE color)
Mirrored backglass, plaque, autograph - LE feature only
Most of my games are premiums so I know the math well as I do these upgrades with all my premiums and it usually runs about $800. Although I have had LE's (and currently have a SWLE). The main reason I mostly go the premium route is that I hate all the drama upon the initial release with trying to secure an LE as well as making me commit before I ever see it play. If it also saves me a little money and gives me some choice in how I customize it then so be it.