MC300 MC252 MC501 recommendations based on my setup


So I have 2 systems, 1 downstairs that runs the whole house (4 sets of speakers on a switch) with a C48 and MC252 and Paradigm Signature S8's as the mains in the primary listening area. 
  
I also have a medium size room (large for a house) with a C40 and MC300 on Polk Rti A9's that are just a place holder until I can find the real speakers that I want (Thinking B&W 800 series).  

I like to listen to my music very loud and like to "feel" the music but the MC300 is not cutting it with either set of speakers.  

I have an opportunity to get a set of MC501's and would really like to see what the suggestions would be for a set of speakers that would pair well with them also considering I can move any of the other components upstairs or down stairs to get the best setup in both areas. 
Do I buy another  MC252 and bridge them or biamp them?  Is the MC501 investment worth the upgrade assuming the addition of B&W 800D's later?  How much are the MC501's worth in good shape? 

I have a lot to consider because I am also thinking about upgrading preamps also (interested in a tube pre C2300 or 2500 based on past experience w/ a Vincent MK236) but mainly listen to SACD's in one area and a combination of vinyl and SACD's the other.  (BTW, I also have an NAD M51 DAC that I really like upstairs with the C40)
gene3x
I forgot to add that if I did not buy the MC 501's I would likely buy an MC 352 that I can get an excellent price on. Assuming I like to listen loud on a regular basis is the MC 352 enough in a medium size room?  Currently I can talk and have a conversation with the MC 300 power guard lights blinking at me. That seems strange to me on both the 8 ohm tap and the 4 ohm tap. 
I use a MC352 (this amp was designed by Charlie Randall one of the best sounding SS amps they made) with a pair of Dynaudio Contour 3.0's, these speakers are rated at 200watts, I can easily drive them up to 350-400 watts (i like music loud too). One of the best combos I have heard is the MC352 partnered with a high quality great sounding tube pre amp. The MC2300 or the 2500 would make for a fine sounding system indeed!  I went a different route with a tube based pre amp from another company for financial and sonic reasons. MAC dosent make the MC352 anymore so if you can snag one at a great cost I would in a heartbeat.

Matt M
Thanks Matt!  I will check out Dynaudio for sure.

Of course they don't make the MC501's anymore either.  I am just trying to determine if it is worth the extra coin to get the MC501's at about double the cost of what I can get the MC352 for......

Does anyone have an opinion on the Bryston Model T's or the McIntosh XR100's?