VM's storage settings

Hello.

Could u help me to choose right and safe settings in ‘Storage’ area please:

  1. Should I check ‘Use Host I/O Cache’ option ?
  2. How much Port counters should I use for SAS(LsiLogic SAS) and for SATA(AHCI) buses ?
  3. Should I check ‘Solid-state Drive’ option for a .vdi image?