You might need to get some quotes for pressing the new bushes in the arms from your local garages. It will also depend on what you want to do with the car. For a track orientated car, you can go for poly bushes from Whiteline, Energy or SuperPro, for top quality stuff you can go for solid bushes from SPL.
If you're happy with the OEM feeling of the car, I'd go for the arms as it is much easier to replace. Swapping all the bushes won't be an easy job, some only come out with the grinder