hi bill,wow you have some pretty desirable mac gear,if your mx-110's serial # end's with the letter Z then it's considered to be a z model & worth a considerable amount more than a standard mx-110.
your mc 225 is also in high demand,the mc 225 is a fine amp but at 25 wpc it's easy to see how you could blow speaker's easily with it,it's easier to blow speaker's from pushing an underpowered amplifier to it's limit's trying to reach acceptable volume level's as oposed to a high powered amp that is able to stay within it's boundrie's & continuously produce clean wattage.
im not familuar with your marantz tuner but all vintage marantz tuner's with the oscilascope feature are in extremely high demand with the model # 10b being the holy grail & selling up into the multi thousand dollar range,it's worth looking into the value of that unit
if you do choose to sell your vintage mac gear to fund an upgrade the mc 225should bring between $1,200 & $2,500 depending on condition, the mx-110 should bring between $700 & $1,200 also depending on condition & serial #
the 901 is actually a pretty good speaker,it's design is very simple,all the driver's are mid bass driver's(8 driver's) that's why they have the active eq to adjust tone,most people have never heard a properly amplified & properly set up set of 901's plus all the ht in a box crap they tout as being state of the art help's give the 901's a bad rap but they can sound excellent & extremly dynamic.
it's been year's since i owned 901's but if i remember correctly bose used to rate the 901 for a maximun wattage of 350 wpc @ 8 ohm's which is obscenely low for that type of speaker but as so many other speaker manufacturer's do they choose to under rate them for warranty issue's instead of optimum performance,now they dont even rate them at all
ive allready mentioned wattage & high current in my previous post & when i had mine the more power i threw at them the more they came alive at all listening level's,the bigger the amp & more current the more dynamic they will become,they can go from sounding weak & thin to extremely dynamic depending on the amp,i wouldnt worry about blowing a driver from over powering either,as long as your not pushing your amp way too hard the 901's will take lot's of power & you will be able to hear when they are being driven beyond their capabilitie's.
here are a few amp's that will drive the crap out of the 901's.
crown ce-4000 600 wpc @ 8 ohms,pro amp, $1,000 to $1200
crown ce-2000 400 wpc @ 8 ohm's,pro amp, $400 to $600
carver silver 7 t monoblock's, 575 wpc @ 8 ohm's,home audio amp's, $1,000 to $1,300.
carver tfm 55x,380 wpc @ 8 ohm's,thx certified home audio,$500 to $800.
ive owned & used all of the amp's i listed with the crown ce-4000 probably being the best sounding amp not to mention a killer value,ive also compared the ce-4000 directly against a mcintosh mc500 500 wpc amp i used to own & both were very close in performance,in fact they were so close in performance that it came down to price, being that the crown was $2,500 cheaper than the mac it was the better amp of the two.
i'd be curious as to what amp you end up deciding on & how it work's out for you.
have a good day.