Audio Systems: theatre hookup, high quality control, dolby prologic

Question
hello.I own a nice Harman kardon reciever AVR235.It is really great but doesn't have enough power for me,only 50 wpc.it has all the surround decoding i would need but insufficient power.I bought an Acurus A200x5.At 200 wpc this is the power i need.I also bought a B&K AVP4000 preamp for high quality control.It decodes THX and Dolby Prologic(but not Dolby Digital or DTS).Is there any way to use the power of the Acurus to power everything,the B&K to control everything,and the added surround decoding of the HK.If not is there any external decoders for DD and DTS i could use?The B&K is new and really great and i would hate to have to ditch it in order to get DD and DTS decoding capabilities.Any help would be greatly appreciated

Answer
Pre amp, Receiver? Too many unecessary gain stages. A lot of Ad Hoc mix and match to make a receiver work that will be really outdated pretty soon. If you can sell the stuff on ebay and get all you want in a new receiver you would be better off, also because you at least would have a warrantee. I generally recommend the latest in technology, unless you have performance equipment.