Cisco :: How To Secure Vlan Server

due to goverment regs i need to secure the server vlan at work. i was using a acl applied to the vlan, but thought adding an ASA would provide better security. I had done some brief review of my design and options. I was thinking of using vrf and connect to exsisting ASA 5520. i would need to add the server subnet vrf to the global routing table. seems to get tricky. I am currently testing just adding the firewall to a vlan with a client. No vrf. This seems to working ok but the inbound and outbound rules have to be adjusted more than i realized. I was expecting traffic inaitiated outbound to flow unrestircted and filter on the inbound.