Thanks guys , some very interesting answers there.
I do use a fair amount of virtual inst, such as steven slate drums, garritan strings, plus all the x1 bundled stuff, so a playable latency is important to me. I only have a home studio so im not sure i would notice the audio quality difference in the RME that is indeed if there is one and at £750 instead of just over £500 for the Octa, im not sure thats justifiable, when i can probably spend the difference in ££ making my signal chain better quality elsewhere.
I would actually like to do away with my huge mixing desk, as i have no real need for it, so the octa seems like an ideal solution. Real shame it only has one headphone ouptput tho
Bibs