I am currently using some of the Orion 90c lipo's that you have mentioned.
For the money, they are absolutely brilliant.
But.... to be honest.... I haven't noticed them to be too much different 'punch' wise from the 50c Lipo's I was running previously (there is a difference, but it's not night and day).
That said, would certainly recommend giving them a try (JE Spares have the saddle ones for around 75 quid)
