The numbers for every available season have been crunched... here are the top 25 most valuable forwards by WAR since the start of the 07-08 season:

(DGS= defensive goals saved, FO=faceoffs, PD= penalty differential, rep= accounts for difference between average and replacement level)
playerGPTOI SHOOTINGPASSINGDGSFOPDREP WARPER 82
SIDNEY.CROSBY82417247.9 137236.1-7.68.918.6148 72.17.2
ALEX.OVECHKIN98820612.2 312.76.4-25.9-0.510176.9 63.95.3
EVGENI.MALKIN82916616.3 124.2196-5-14.64.5142.6 59.75.9
PATRICK.KANE97119524.4 101.4169.3-9.8-2.517.9167.5 59.25
ANZE.KOPITAR100121090.5 14.3142.223.111.825.7181 53.14.3
JONATHAN.TOEWS94218730.9 76.9107.910.231.47.2160.6 52.64.6
STEVEN.STAMKOS80315559.1 175.368.6-10.7-26.9133.3 49.55.1
JOE.THORNTON96318042.3 -79.524328.911.88.3154.9 494.2
PATRICE.BERGERON85916057.2 70.58143.738.4-6.4137.6 48.64.6
JOE.PAVELSKI98218598.8 98.947.123.314.718.8159.5 48.34
NICKLAS.BACKSTROM95518780 -34.2224.211-0.1-8.2161.2 47.24.1
CLAUDE.GIROUX88917530.4 8.6152.7-7.319.120.2150.1 45.84.2
JOHN.TAVARES81416190.7 121.585.5-24.65.114.6138.7 45.44.6
BRAD.MARCHAND75113256.4 101.6102.216.9-1.4-3.5113.4 43.94.8
PAVEL.DATSYUK58911726.6 36.8114.543.81023.4101 43.96.1
RYAN.GETZLAF91418729.4 -39.720920.4-4.5-20.9160.7 43.33.9
DANIEL.SEDIN82715313.3 61107.423-0.80.3131.6 434.3
ZACH.PARISE85216234.1 112.624.19.6-0.923.2139.4 41.14
HENRIK.ZETTERBERG80115989.2 16.1122.814.51.811.7137.4 40.64.2
ERIC.STAAL99519679.8 7775.2-21.4-5.75.3168.9 39.93.3
BLAKE.WHEELER93017202.7 32.9134-4.8-2.1-8.8147.3 39.83.5
HENRIK.SEDIN84716012.7 -77.5227.118.8-6.5-3.5137.6 39.53.8
JAMIE.BENN81415044.9 96.668.3-0.3-1.32.2128.8 39.23.9
PHIL.KESSEL99518370.5 111.668.6-45-1.51.2157.6 393.2
COREY.PERRY90717004.9 113.428.85.8-1.4-6.2146 38.23.5
[TBODY] [/TBODY]

I don't know about you, but that seems pretty spot on to me.

Here's the top 15 on a per 82 game basis ( minimum of 82 GP):

playerGPTOI SHOOTINGPASSINGDGSFOPDREP WARPER 82
CONNOR.MCDAVID3517525.6 57.7112.1-12.4-618.964.1 31.37.3
SIDNEY.CROSBY82417247.9 137236.1-7.68.918.6148 72.17.2
AUSTON.MATTHEWS2825299.1 91.714.8-2.51.36.545.1 20.96.1
PAVEL.DATSYUK58911726.6 36.8114.543.81023.4101 43.96.1
EVGENI.MALKIN82916616.3 124.2196-5-14.64.5142.6 59.75.9
NIKITA.KUCHEROV5159242.7 87.4102.42.9-0.12.778.9 36.65.8
DAVID.PASTRNAK3906739.6 79.147.23.4-0.411.157.5 26.45.6
ARTEMI.PANARIN3917697.8 31.695.32.8-0.26.365.6 26.95.6
ALEX.OVECHKIN98820612.2 312.76.4-25.9-0.510176.9 63.95.3
STEVEN.STAMKOS80315559.1 175.368.6-10.7-26.9133.3 49.55.1
PATRICK.KANE97119524.4 101.4169.3-9.8-2.517.9167.5 59.25
LEON.DRAISAITL4228256.1 39.779.2-8.60.47.170.4 25.14.9
ELIAS.PETTERSSON1392541.9 10.719.42.4-1.88.421.6 8.14.8
JOHNNY.GAUDREAU4648846.5 23.785.8-6.3-0.122.875.5 26.94.8
BRAD.MARCHAND75113256.4 101.6102.216.9-1.4-3.5113.4 43.94.8
[TBODY] [/TBODY]

I'll continue to update tomorrow. Message with any questions or data requests.