CM really only makes two really good 120mm coolers the 212+ and the V6GT.
All the others are average imo.
The V6 and the V6GT have the same dimensions.
131 x 120 x 165 mm/ much bigger then most tower coolers.
The 212+ in comparison is 120 x 79.7 x 158.5 mm.
The width of the 212+ will play alot better with your ram since the dimm intrusion is much less.
The only other suitable coolers are the Prolimatechs at a much higher cost/fans not included.
Megahalems Rev.B (L)130mm X (W)74mmX (H)158.7mm
Armageddon (L)144mm X (W)50mmX (H)160.3mm
The thinner the width the less dimm intrusion/overhang