Have you had a quote from TBR for Old Man Emu suspension? As club members we get a 10% discount with them.
I have Old Man Emu on my 80 (see my signature line for the spec's) which I sourced from TBR, it was a couple of years ago and the vat was lower, but I seem to remember it being sub £700 for the springs, nitro charger shocks and a steering damper.
Have you done your research with regard to the pros and cons of the different kits, and how they'll suit your needs? I ask, as I'm very happy with my kit, but it is firm, and I would say that if you fit OME suspension to a standard 80 then it may be too hard for some peoples taste. If you plan on adding some weight to the 80 then that'll make the suspension work and it'll be a nice ride. Mine rides very well with a load on, and copes well with rough surfaces taken at speed. With no load and road tyres fitted, it corners extremely well!
If I was doing it again to an 80 that was staying fairly standard, I'd be tempted to try the Ironman kit. Many guys have these kits on here and are pretty happy with their performance, but a little less so with the durability of the paint finish.
Decisions, decisions, it's all part of the fun!