Help me upgrade

I currently have a yamaha DSP-A1 with the BK 200.5 amp. I want to go to a digital amp that accepts hdmi. What should I get?
HDMI inputs on power amp are none existence. Only Receivers and HD Processors would have HDMI inputs. Power amps only have Balance and Unbalance inputs, what you need is a processor with HDMI inputs and you're done, leave your BK amp alone and upgrade to a HD Processor.
yup that's what i meant. is it worth the upgrade? Will i hear a difference if I switch to hdmi inputs?
Yes, you'll get your money worth. A decent HD Processor will run around $1200-$1500, are you willing to go there? keep an eye on Audiogon's ad, and you'll run into something that you might like, good luck.
Will i hear a difference if I switch to hdmi inputs?
If the source is Blu-ray material, then you'll likely note an audible difference since HDMI is the only way to get the HD audio formats from the player.
Right now i'm using my bluray player. It is decoding the audio, converting it to lpcm and sending it to the receiver. The receiver applies no processing to the signal, and just amplifies it. I wonder is this just as good as good as sending the audio bitstream to the receiver for decoding and processing via hdmi?
If the player is decoding the HD audio to LPCM and you are connecting that using a non-HDMI digital output to a receiver, you are transmitting standard Dolby Digital via LPCM - not the HD audio. HD audio can not be transmitted digitally except via HDMI -- due to bandwidth limitation.

It really does not matter sonically where the decoding is performed. Sending bitstream from the player will not allow combining the secondary audio stream; sending LPCM will.

So the bottom line is: use HDMI if you want the HD audio sent from the player digitally. It can be decoded either in the player or the receiver.

You can use analog audio connections since the player can do the decoding.