Sounds like both boards have their issues - taking that into consideration, which is a better matchup for an i5-4670K build?
Bundle spread is $5USD in favor of Z87-A. Both boards support SLI - however, that is NOT a primary concern. (The winning mobo will be used with a single NVidia GPU.)
All HDDs are WD (existing Caviar - one Eco-Green and one older non-SE). SSD will be either Samsung or Plextor. Keyboard and mouse (existing) are USB. Optical drive (existing) is SAMSUNG SH-223B. All existing drives are SATA.
Bundle spread is $5USD in favor of Z87-A. Both boards support SLI - however, that is NOT a primary concern. (The winning mobo will be used with a single NVidia GPU.)
All HDDs are WD (existing Caviar - one Eco-Green and one older non-SE). SSD will be either Samsung or Plextor. Keyboard and mouse (existing) are USB. Optical drive (existing) is SAMSUNG SH-223B. All existing drives are SATA.