G2V 

Sun is the G2V dagger standard
(Garrison94,JM53,Morgan65,Morgan71,MK73,Keenan85,Houk,Keenan88)

For discussion on spectral type of Sun, see Keenan 1991 (PASP, 103,
642) and Morgan & Keenan 1939 (PASP, 51, 355).

Skiff08 flags three stars as G2V MK standards, all from Keenan89: HD
146233 (G2Va), HD 45184 (G2Va), and HD 76151 (G2V).

Morgan65 did not classify any Hyads as G2V.

Cowley76 uses HR 483 as their G2V standard.

After the Sun, RECONS lists Alf Cen A (GJ 559A; J1439-6050) as the nearest G2V.

Gray01/03/06 list 48 nearby G2V stars. Median HIP colors:
<B-V>(G2V) = 0.647 (+-0.003 sem, +-0.035 stdev; N=48)
<V-I>(G2V) = 0.706 (+-0.005 sem, +-0.024 stdev; N=48)

# No Standards
MK43 surprisingly does not list a G2V standard. 

# Other Standards
HD 45184 = HR 2318
  G2Va: Keenan88,Keenan99
  G2V: Houk82
  Skiff09 lists *only* the Keenan89 type. So "all" published types are G2V or variant.

HD 76151 = HR 3538
  G2V: Keenan88,Keenan99,Gray01
  G3/5V: Houk99(q=2)
  G5V: Harlan74
  G3V: Popper43,Joy47
  At least Keenan & Gray agree. 

HD 98230B = xi UMa B = HR 4374
  G2V: Keenan88

HD 146223 = HR 6060 = 18 Sco
  G2Va: Keenan88

lam Ser
  G2V: MK43

# Weak Standard
HD 2141 
  G2V: Keenan89,Keenan99(not in Keenan88)
  G3V: Houk88
  G1V: McNeil86(by McNeil)
  G2IV-V: McNeil86(by Keenan)
  McNeil86 notes "metallic lines very slightly weak?"
  Not a great standard given G1-G3V published types.

HD 44594 = HR 2290
  G2Va: Keenan89,Keenan99(not in Keenan88)
  G3V: Houk78
  G4V: Jaschek78(Evans66)
  Not a great standard given G2-G4V published types. 

HD 186408 = 16 Cyg = HR 7503 = GJ 765.1A
  G2V: JM53
  G1.5Vb: Keenan88

HD 10307 = HR 483
  G1V: Keenan89,Keenan99,Gray03,Barry70(G1Va)
  G2V: JM53,Jaschek64(all! N=24!),Jaschek78,Garcia89,Roman52
  G1.5V: Garcia89(!),Hoffleit91
  F8: Cannon18
  B-V(HIP)     = 0.618+-0.001
  B-V(HIP,G1V) = 0.602
  Vmag(Merm91) = 4.958+-0.011
  note: classification has migrated from G1V to G2V, but settled post-Keenan89 

# Variant
HD 28099 = VB 64
  G2+V: Keenan99

# Others
Alf Cen A
  G2V: Garrison96,Houk75(Garrison)
  surprisingly few published types