Don't know of any 5 port 10Gb switches. However the Cisco SG300-10 has two 10GbE combo ports and 8x1GbE ports for an astounding £150 including VAT. It's a managed switch too so VLAN's, LACP and ACL's are included.

Other than that there is an 8 port Netgear 10GbE switch but that runs to £550 with the VAT.