I'll get the SSD upgrade... I've been mulling over this for a few weeks now (due to it being the cheapest upgrade of the lot) so will just go ahead and do that.
I'll try my best not to break anything although I can give no guarantee over that lol. it would be just typical that I somehow manage to drop the SSD directly after opening the box. Fingers crossed though, I'm sure it'll all be fine.
At some point down the line I'll get a new system - but for the time being I'm going to persevere with the R4 and eek out as much as possible from it... in a couple of years, if I'm still using this, it'll have been going for ten years which is great... even taking into consideration the inflated price I originally paid for it - can't complain.