Based on your comments and parameters this seems to be the best fit for you.
DGX Custom - DGX Singles Harness / Backplate / Wing Package
That is the one he mentioned in the OP.
I don't know of a better deal than that.
The Blue Reef SS plate, at $70 from LeisurePro, is less $$ than the DGX plate by itself. But, DGX is giving a pretty good package deal discount to get the whole package at once. If you had to buy a wing and harness separately, I think it would be tough to do that and actually save any money, compared to the DGX package.
That said, I personally would spend a LITTLE extra.
$ 70 - BR Plate
Blue Reef Stainless Steel Back Plate
$170 - HOG 23# wing
Hog 23lb 360 Wing
$ 20 - Dive Rite 2" crotch strap
Dive Rite Crotch Straps
$ 26 - 2 x ScubaPro-style Quick Release tank straps
Tank Strap, Quick Release with S/S Hinge Buckle
$ 10 - 12' of 2" webbing
Goldilocks Harness Webbing, per {1 ft | 30 cm}
$ 3 - 2 x Bent D-rings (chest)
DGX S/S {2 in | 5.1 cm} D-Ring w/Bend
$ 2 - 3 x Tri-slides
DGX S/S {2 in | 5.1 cm} Belt Slide
$ 4 - 2 x Rigid D-rings (waist)
DGX S/S {2 in | 5.1 cm} Rigid D-Ring, Perpendicular on Slide
$ 12 - XS Scuba buckle
XS Scuba Clear-Path Buckle
Total: $317
Those are the specific bits that I use and I like each piece better than the "standard" version it replaces in the "package". The XS Scuba buckle is glass-filled nylon. Strong enough to use as a weight belt buckle. Way more than strong enough for a BP/W buckle. And it's quiet and it is black. I don't get stalked by barracuda anymore since I switched from a stainless buckle to the XS Scuba.
To me, the extra time ordering and the $17 and maybe some extra shipping would be well worth it to get these individual pieces. But, I can't say any of it would be huge difference to the basic DGX package.
Optional
$ 20 - 2 x DGX trim weight pouches
DGX Gears Trim Weight Pocket (each)
$ 10 - DSS cam band tension pads
Cam Strap Tension Pads, one pair universal scuba
$ 17 - 100' roll of thin bungee
Shock Cord - {100 ft | 30.5 m} Bulk Rolls
The DGX trim weight pouches are really nice. Huge velcro patch for keeping them closed. And they are small. Just barely big enough to hold a single 4 or 5# weight. I had XS Scuba weigh pouches and they were huge. A single 1 or 2# weight in one of those was really loose flopping around in there.
The cam band tension pads are nice, but definitely not a requirement. They give you something to squeeze when you tighten the tank straps, so they maintain some tension on the tank straps even if the straps loosen a little bit after you get in the water. [EDITED to correct info]
You could just buy 10' or so of bungee for 4 or 5 bucks, but it is SO handy! I finally got tired of buying short lengths again and again and just bought spools of thin and a thicker one (don't remember exactly which).
The thin stuff will be good with the 3rd tri-slide mentioned above to make a LPI retainer loop on your upper left shoulder. And it will be good to make your own bungee necklace for your secondary second stage reg (if you dive with the bungee necklace setup). And many other things...
