TI-Sissy, you are going to have it hooked up to your new TV, right? That should be more than adequate. No amplifier needed, Just Y off of the AV port. Even if you get a F18A, you can still use audio off the existing port.
This is what I do with my monitor, f18a to vga, and composite cable audio out to a RCA -> miniaudio jack and my monitor has built in speakers/amp