A couple of questions -- I'm not sure I understand
As far as a recommended upgrade, I haven't heard the Mani-2's, but they should be pretty nice for the prices I saw on the web. The only monitor I've heard in that price range are the offerings from Dynaudio -- which I loved BTW. If space is a concern, the footprint of the their floorstanders is going to be the same as a stand mounted monitor, so you might look into that as well.
Other than that, most of the speakers I've personally listened to in that price range have been floor standers.
I'll be curious to see what you decide on though! You've got a pretty fun project!
JCD
I'm not sure why you don't set the crossover of receiver/pre-amp to 60 or 80. Even though the Mani-2s are rated to go down to 29hz, I think they'd sound better if they didn't have to.
As far as a recommended upgrade, I haven't heard the Mani-2's, but they should be pretty nice for the prices I saw on the web. The only monitor I've heard in that price range are the offerings from Dynaudio -- which I loved BTW. If space is a concern, the footprint of the their floorstanders is going to be the same as a stand mounted monitor, so you might look into that as well.
Other than that, most of the speakers I've personally listened to in that price range have been floor standers.
I'll be curious to see what you decide on though! You've got a pretty fun project!
JCD