The Orion cells are very good, probably be running Orion myself next season (waiting for the 2011 list before buying cells ... only sensible choice unless you need them NOW).
That said I know a couple of people who use IP cells with no issue. I think the bad name is left over from their explosive NiMh cells, that said I had no issue with those personally either.
I think the main thing with any form of RC battery is to look after them and charge them at no more than 1C and all should be fine.
I would say buy from the UK as I've heard of quite a few cases of people having iffy LiPos that have needed replacement in a very short time. A UK shop is much more likely to be able to help quickly and at lower cost to you than somebody in Asia.
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