i am totally new to power kiting and would love to get into it. i have flown a stunt kite but would much prefer power. i was just wondering which kite would be the best to start of with. also is it the bigger the kite the better.

no that is not the case at all. I am not an expert yet, but i have done lots of research on quite a few kites. I have a bullet 4.5 and a blade 6.6, and super 10 now.

You need to decide what you want to do with your kite. Ex. Scudding, jumping, buggying, landboarding, ect...

Then from there you need to find a kite which is best for these activities. Ex. Blades- Jumping activities
Bullets- landboarding, buggying, scudding...

Then take into consideration how much you weigh and how fast the winds are in your area. The faster the winds, the smaller the kite you need to power you. The slower the winds, the bigger the kite you need. Try to find a kite inbetween which will suit your needs.
Try not to go bigger then you need as you will spend lots of time on your rear end.

Check out Flexifoils as they have a great line of kites for beginner through expert

I started with a proteam 8 about 10 years ago, and then went on to build up a stack,which is a good place to start as you simply add or take away a kite to adjust the power on the day. This is great for jumping and geting dragged, but is a bit to fussy for buggieing etc

Flexifoil does make a great line of kites. I would recommend learning on a 3 or 4 meter kite to begin with. This way you have enough power to get used to, but not really enough to get badly hurt unless you go out in a gale. (which you will do after you have built up your skills and confidence) I agree with the above statement, except I would say blades more for mountainboarding than bullets. Lift is good on an ATB.

Scoop

I started this summer with a HQ Beamer 3.6 which gives enough power for skudding and jumping when the wind is reasonably strong. It is also suitable for landboarding although again only in a reasonable wind.
However being your first kite definitely don't get anyhting bigger than a 4 metre (first time I took mine out it didn't so my fly as drag me up the beach) and when you have learned the basics you could go for something bigger ro more specifically designed for what you want to do. I didn't want to spend £300+ for my first kite not knowing what I would really get out of it. So if you are going for a budget traction kite either the HQ Beamer or PKD Buster are good choices.

Is there a middle between bullet and blade? Is it crossfire or samuri?

I'd say the sami is closer to the bullet and the crossfire is closer (not not that close) to the blade. Something like a PKD Brooza but be closer to the middle but on the side towards the blade, but not as close as the crossfire. Sounds like a diagram would be useful...

thanks