You can still find some low end models that Only pass hdmi through but not switch.
More importantly you want full Pre outs, and that will be your limiter.
Do you know what brands your local retailers carry?
And more importantly, does your htpc handle the the formats?
There are many low cost ( under $70) video cards that can of your current setup does not.
S o refresh start by looking at receivers that have pre outs, many models from Denon, Yamaha, Onkyo, Marantz and pioneer ( and more) do have pre outs.
Do you have a budget in mind?