Welcome!
They are a fantastic car, I've had mine since new in 2008. At 163,000k's now and still going strong. Recently had a ECU Remap on it, much more sporty now.
I have not really had any big problems that were not self induced.
I am actually considering getting another Ritmo since mine has run up the kms now.
What model/colour is yours?
Also .. as for parts and what not, you should go see George at Revolution Automotive. He has been looking after mine for years, and has no problems getting parts.