Joe,
With ASA5500 series you can use it for both , firewall as well as for IPsec L2L, SSL webvpn , RA server L2TP etc.. in fact the ASA5500 is the migration platform for VPN Remote access since VPN 3ks concentrators have reached end of life.
I would recommend in future if your budget permits it, use another ASA5510 with FO license and provide an Active/Standby architecture.
Reference this link for all variety of features and implementation scenarios so that you can start geting acquainted with ASA code 7.x and above.
http://www.cisco.com/en/US/products/ps6120/prod_configuration_examples_list.html
Rgds
Jorge
Jorge Rodriguez