Saucony progrid guide 3 v 5?

It seems saucony progrid guide 3 are being phased out as cant get my size on any site. I've been though about 15 pairs as they helped me to overcome a knee problem caused by previous trainers. I've been told best replacement is the progrid guide 5 but would appreciate any views before I invest another 85 quid a pair! Help?

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