Min,
I agree with Shannon's advice. The stock Eiclone circuit should have sufficient power. I went the PPP route initially and built a prototype. Then the project sat for a few years. The reason is that PPP increases the size and complexity of everything, PT, OT, bias network, etc. It also makes stability harder, although doable if you want to go that route. I still plan to build a pair of PPP Ikes someday.
I built a pair of octal Eiclones about this time last year, and could not be happier with the result. These are awesome amps and I have all the power I need. I'm driving a full range speaker (B&W 802's) and the low end is amazing. These are the best sounding amps I have ever used in my system.
I started off using JJ KT-88s biased at 64ma. Then, over the past winter I used some Tungsol KT-120s biased at 75 ma and then 90 ma. I really like this tube, but at 90 ma my PTs were getting pretty hot. So for the summer, I have a quad of Winged C 6550s biased at 60 ma. Everything I use sounds great.
If you have efficient speakers, the stock circuit will be everything you need and then some. If you still want to do PPP, you can rig a separate bias circuit. See my Ikezilla posts for the bias schematic that I did on my prototype. I used a Maryland Toroid PT that had a bias tap.
http://www.diytube.com/phpBB2/viewtopic.php?t=846
JT