There's lots of good patches out there.
I've heard that the PES-x-ppf patch is good. And so is the WEmerica patch (WE9 & PES5) and Fishcake patch.
It depends on what you want from a patch really.
I wouldn't download a patch right now if I were you though. I have a feeling that there'll be quite a lot of activity in the January transfer window.
Which means that any patches out there at the moment will have updates (for the January transfer window). But you need both the original patch and the January update patch in order to have a fully up to date PES5.
This is what I'm doing. I'm waiting for an update patch to be made for the January transfer window.
Only then will I download the original patch, apply it, download the January update patch, apply that and then burn back to DVD-R.
I realise this won't happen until 1st February 2006 at the earliest. But, it's worth the wait in my opinion.