My mums got an RSI (at least for another week or so). Nice torquey engine, not very reliable car - or maybe Im just being annoyed by the tiny niggles and faults that she has to pay Renault £70 an hour to fix.
But , if I were in the market I would definately go for the valver its much more of a classic than the RSI. On the other hand, if the financial difference is too large, the RSI is a fun and fastish car (goes 205-10 kph on the longest of straights).
Good luck,
CJ