What power is required to drive Paradigm 100's

The Studio 100's have the same published sensitivity as your Studio 60's. They both have 91 db/watt (in room) and 88 db/watt (anechoic). A Denon 3803 is rated at 110 watts per channel and that is well within the 15-350 watt "suitable amplifier power range" spec for the Paradigm Studio 100's.

If your question is really "how loud will my Denon drive them", then the answer can be calculated at this web page:

http://www.myhometheater.homestead.com/splcalculator.html

Plug in the following info:

Speaker sensitivity: 91
Amplifier power: 110
Distance: how far do you sit from the speakers?
Number of speakers: 2
Speaker placement: select the one that applies
Click "CALCULATE"

You will find that the room placement and distance from the speakers to your listening spot will make a big difference in how loud they will sound.
After you calc it with the correct input data, try running it again but bump the watts up to 200 or 250 to see what the difference would be. Keep in mind that anything over about 105 db is quite loud and every additional 3 db doubles the Sound Pressure Level.
While those 105+ db SPL might be more than you'd want to listen to, the higher power amplifiers typically have higher damping factors which translates into better control over the bass drivers under any conditions. That control is heard (and felt) as tighter, punchier, and often deeper bass with less tendency to distort and/or clip when played at high volume levels.

I used to own the original studio monitor, (which is basically the first studio 100).
The woofers bottomed-out a few times at high levels with a 250wpc Adcom 5800 power amplifier.
The sound was truly impressive though. These speakers come very close to the Servo-15 in absolute low frequency performance and cleanliness with a high-current amp.

I'd say the Denon is going to be more than adequate for anything but lease-breaking SPLs.
(coincidentally, I use a Denon 3802 as the front-end for my HT; it's a very nice receiver)

Thank You for your responses..
In response to some questions about the room-12x18 opens
to a hallway and a dinning room on the other side. The
ceilings are 8 ft. I listen at low to moderate volumes
and don't use a sub when listening. I don't really want to
upgrade my receiver, mostly because it's fairly new and
want to get a few more years out of it. It sounds like the 100's will work with the receiver, although it's not the
best option.. I'm hoping for a modest upgrade and it sounds like 100's might provide that. Thanks Again.

I have a pair of Paradigm Studio 100's and also a Denon 3803 A/V receiver. I find the Denon 3803 fine for home theater but sonically just not good enough for serious listening to music. And let me add that I'm a Denon fan: I've got two Denon DCD-1650AR CD players (great!) and two Denon PMA-2000IVR integrated stereo amps (great!). There is no comparison between the Denon 3803 and the PMA-2000IVR as an amp for music, not home theater--the PMA-2000IVR is far superior. I bought the Studio 100's brand new last year from a local dealer who was closing out all his Paradigm stock (I also bought a Paradigm Servo-15 subwoofer (great!)) and ran them for three months in my music system. They are not a difficult amplifier load and are reasonably efficient (91dB) so in terms of power you have enough in your 3803. But ultimately I retired my Studio 100's because I just couldn't take the hard, metallic quality of their metal-dome tweeters any longer. Lots of listener fatigue from these tweeters. However, if you already have Studio 60's and don't have a problem with the highs, evidently these tweeters don't bother you. The midrange and bass of the Studio 100's seemed fine to me, if not the last word in openness or transparency; it was the highs I couldn't live with. But I've felt that way about just about every metal-dome tweeter I've heard. Anyway, I've got a one-year-old, mint-condition pair of Studio 100's, with three months use on them, that I'll make you a hell of a deal on; they're just sitting here and I'm not getting any good out of them. Good luck.

I have the Denon 3803 and have added a Bryston 4B sst power amp 250 WPC and now my paradigm studio 100's V2 have come alive for the 1st time.