If you like the 2008 fuels go with the new models they have a bit more depower and better relaunch than early models but still kick ass in performance. I dont know it the 2011 kite is out yet,( should be soon), but flew the 2010 kite last season and its great.
The RPM may also be a good choice if you want something a bit in-between, Being a bridled C kite it has a huge depower range, light bar pressure is easy to unhook on and can be tuned to your ridding style by adjusting the bridle and turning speed. The bars have also changed a lot since your last kite, much better smoother and less cluttered.
The octanes are running out cheap at the moment as they are not getting continued this year, there is some reports of them falling out of the sky but was only with some of the early ones, by all reports all issues with the originals were fixed and there havn't been to many issues since. Nearly everyone that has one loves it.
The Rally looks to be a good all round kite, if you haven't tried a delta before it would be worth demoing one. This kite is what they have replaced the octane with for the moment. I haven't tried one yet but you will find some reviews on the forums and youtube.