Thanks Kowal,
                          That last one is a very good comparison site.
Thanks to all of you for your advice and suggestions. I may well go for the J-Stick.  Being in the UK I'm quite used to J-Sticks in use in most arcades. In fact I use them myself at work. What I needed to know was really, was the Pac stick a better option. But it seems that you answered the question for me.  I may well get the J-stick and fit a slightly stronger spring. 
Best Regards,
Julian (Fozzy The Bear)