Hi Cow,
This was discussed many times before in MLOC forum. Would help a lot if you try search and I'm sure many discussion on engine oil would turn up.
As for which is good/recommended, you need to share your driving preference. Ie normal street driving or lots of uphill/stress driving or you for racing / trek use ? Difference application uses different greds of oils and brands. Ie, 10w-40 is usable for normal street driving but not for stress and would be good to go up by 15w-50. Whereas for trek, will be good to go even higher to the 60 to protect your engine but day 2 day driving with viscocity of 60 oil will be very sluggish for your driving experience, no doubt it is thick for protecting your engine though.
I'm using Motul 300v 15w-50 for normal street driving. Very pricey but is a good oil (esther base).
Hardly go on trek or stress so can't comment any other oil.
my 2 cents..