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ASA5505 can handle 10Mbps connection without any issues and it will not be your limiting factor with that speed. I would rather look into your internal switches and depending on their performance see if upgrading is necessary. 
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I suggest you add only 1 C3750G and conenct all your servers, printers and firewall to switch and replace basic switches with 2non managed switches.<br />
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Adding C3750G will give you 1000 MBPS speed, VLAN option (future), 4 SFP (Fiber Option), Ether Channels (Multi Connection), VTP domain and many more.
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<div class="content wysiwyg-content">
Current setup:<br />
<br />
ISP (T1 connection) -&gt; ASA 5505 -&gt; 2 non-managed, basic switches -&gt; 40 workstations (including a Windows 2003 Server that handles DNS)<br />
<br />
New Setup:<br />
<br />
ISP (10MB Dedicated connection) -&gt; ASA5505 -&gt; ? -&gt; 40 workstations (including a Windows 2003 Server that handles DNS)<br />
<br />
==========================<wbr /><br />
<br />
I have recently upgraded our internet connection to a 10MB dedicated connection. &nbsp;My previous setup using the ASA5505 firewall as a firewall and router works reasonably well, but I want to maximize the efficiency of this new higher-speed dedicated connection to its fullest potential.<br />
<br />
My thoughts are to add a cisco router and a cisco managed switch or two.<br />
<br />
I am looking for suggestions for somewhat older/used hardware (to keep costs to a minimum) but that would also allow me to utilize this bandwidth in the best manner possible.<br />
<br />
Thank you for your time.<br />

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Current setup:

ISP (T1 connection) -> ASA 5505 -> 2 non-managed, basic switches -> 40 workstations (including a Windows 2003 Server that handles DNS)

New Setup:

ISP (10MB Dedicated connection) -> ASA5505 -> ? -> 40 workstations (including a Windows 2003 Server that handles DNS)

==========================

I have recently upgraded our internet connection to a 10MB dedicated connection.  My previous setup using the ASA5505 firewall as a firewall and router works reasonably well, but I want to maximize the efficiency of this new higher-speed dedicated connection to its fullest potential.

My thoughts are to add a cisco router and a cisco managed switch or two.

I am looking for suggestions for somewhat older/used hardware (to keep costs to a minimum) but that would also allow me to utilize this bandwidth in the best manner possible.

Thank you for your time.


Best hardware to choose for network efficiency

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

Networking Hardware-Other

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.