Which Electric Bicycle Conversion Kit should I buy?

Hi I´m a little new to Ebikes conversions. What do you think of this kit? http://www.ebay.com/itm/48V1500W-e-bike-electric-bicycle-conversion-kit-electric-motorcycle-kit-/191500546847?pt=LH_DefaultDomain_0&hash=item2c9652731f
Then my plan was too buy some lipo packs on hobbyking. What do you think guys could this work out? Would be nice if I could reach 65-70kph
The bike I planing on using is a 26" mtb with hydralic discbrakes. Whould be nice with your thoughts om this thanks / Fredrik

http://www.greenbikekit.com/36v-250w-gbk-100f-front-driving-e-bike-kit-36v-10ah-li-ion-battery.html

Good cheap kit...

Wilderness Energy offers a good kit.

http://endless-sphere.com/forums/viewtopic.php?f=3&t=66302
Just edit your original post. The kit you listed shows a radial laced wheel. Most 26" wheels should be a 1 cross pattern. There's also a problem using hydraulic brakes , but can be overcome. Check ebay Sweden for 48V 1000W kits if there is an ebay specific to Sweden. Buying from within your country will usually be your best and cheapest option.