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How much power required to drive 85dB speaker?

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Am presently running a pair of 85db / 6 ohm nominal (4 ohm min) rated Dali Grand Coupe bookshelf speakers horizontally biamped off of the Marantz PM17 integrated and SM17 power amp - both rated 60W into 8 ohm.
Dali recommends an amp of 50-250W power rating for these.
Am currently considering getting a pair of more powerful power amps to run these - once again in a horizontal biamped configuration but making the PM17 just a pre-amp.
Have read that these Dali are power hungry speakers but am not sure whether I will really hear a significant improvement for the outlay?
1. How much power do I really need to drive these properly?
I don't listen at obscenely high volume levels but like to listen loud on occasion.
2. Is it worth the expense - am considering Rotel either 120W or 200W into 8ohm power amps.
Cheers.
PS: I am using a pair of Monitor Audio subwoofers (one one either channel) each with 2 x 10" drivers to support the low frequencies on either side - so it is not as though I am short on low bass.

Follow Ups:

Re: How much power required to drive 85dB speaker? - STUART 12:54:51 10/14/05 (0)
Go with the 200W amp
Its always better to have more power then not enough
Especially for music with big transients
How many sound pressure you need?. nt. - ramallo 04:28:38 10/14/05 (3)
nt.
- Guess I want to have an amp that can control the speakers easily - Tagore 05:50:36 10/14/05 (2)
  Guess this is hard for me to answer - I do not listen to really loud music - generally around 9 oclock for the integrated amp volume control.
  I have asked in stores and of course they all tell me that I need more power. I understand that these are hard to drive speakers but would like to make sure that in upgrading my power amp I am not wasting my money on something that is not going to give me much of an improvement.
  - Re: Guess I want to have an amp that can control the speakers easily - ramallo 07:01:31 10/14/05 (0)
    Hello,
    I usually listen music at 95dBA SPL (On my position) (I listen classical, folk, jazz and rock), with peaks over 105dB SPL (Very strong pressure), I use a small 30W tube amplifier, 88dB 1W/m speakers at 3m of distance, for me is enough level. 88dB 1W/m speakers with 30W amp, this is equal to 85dB 1W/m speakers with 60W (If you doubles the Watts you get 3dB more).
    The diference between 60W to 120W is only 3dB (A point on the volume control), 120W to 240W is another 3dB, from 60W to 240 watt you only get 6dB more.
    I believe that 250W is an excess for a 6 inch woofer.
    You tried with a good sub?.
    Regards
  - Re: Guess I want to have an amp that can control the speakers easily - MusicLover 06:16:35 10/14/05 (0)
    IF you listen to soft music/jazz, I would go for 100 watts RMS. THis would give you 100 DB peaks, which should work for you. THat way, if you listen at 90 db, you'll still have some headroom.
    IF you listen ot rock, go with 200 watts RMS.
    If you listen to classical, go with a 300 watt RMS amp (like a carver/sunfire). THat is becuase it has much more dynamic range.
    ML

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