Hey there
At 90kg I'd recommend the 100kg Pro-Jumps which are not in stock till 4-6 weeks.
Pro-Jumps, PoweriZers and flyjumpers are more or the less the same product with a different brand name - from China. Out of these Pro-Jump offer you the best value for money at just £135 including free delivery.
PoweriSers are made in Korea and will be about the £230 (note the S)
For an intro pair Pro-Jumps offer the best value if you are willing to wait