Fred,
If budget is a concern, then you should look at one of the great AVR's on the market. Any of the decent brand names often mentioned on here (Denon,HK,Yamaha,Onkyo,etc.) are all solid state receivers and will drive your 60's with no problem. If you start looking at seperates, you will also get great performance, but will pay a lot more money. Possibly, not noticing any difference.
My guess is that for your room size, any 100-120 receiver will be more than adequate.
The m60's are easy to drive 8ohm speakers. Just one m60 will give you 93dB's while only using "1" watt at 3 feet away(1 meter). 93dB's is very loud. As you double the power, the dB's go up by 3.
So:
1 watt 93dB
2 watts 96dB
4 watts 99dB
8 watts 102dB
16 watts 105dB
32 watts 108db
64 watts 111dB
128 watts 114dB
Just to give you an idea what these levels mean in real world situations and to show where damage starts.
Environmental Noise
Weakest sound heard 0dB
Whisper Quiet Library 30dB
Normal conversation (3-5') 60-70dB
Telephone dial tone 80dB
City Traffic (inside car) 85dB
Train whistle at 500', Truck Traffic 90dB
Subway train at 200' 95dB
Level at which sustained exposure may result in hearing loss 90 - 95dB
Power mower at 3' 107dB
Snowmobile, Motorcycle 100dB
Power saw at 3' 110dB
Sandblasting, Loud Rock Concert 115dB
Pain begins 125dB
Pneumatic riveter at 4' 125dB
Even short term exposure can cause permanent damage - Loudest recommended exposure WITH hearing protection 140dB
