What engine oil for 3rd gen Honda Odyssey

[sschen]

Hi All

I have a 2004 3rd-gen odyssey that is due for its 70,000km service. I noticed in my last service with RAC, that they used Valvoline ProBlend 15W-40 for the service.

I am thinking of using better engine oil. On speaking to a few people, I have been suggested the following engine oil

Penrite HPR5 5W-40 $47 at Repco
Castrol Magnatec 10W-40 $28.xx at SuperCheapAutos
Castrol Edge Sport 5W-30 at $38.xx at SuperCheapAutos

These are prices in Perth, WA.

A friend swears by the HPR5 and he actually prefers the 5W-40 of the HPR5 because of the warmer weather conditions in WA as opposed to 5W-30 of the Castrol Edge

The Castrol Edge is currently on specials at the moment, otherwise it costs about the same as the Penrite HPR5. I am a noob at this as this is my first "decent" car, I have previously always owned car that are older than 10 years old so I never really bothered about getting decent engine oils. My question is that is the Fully Synthetic Castrol Edge Sport a better engine oil to use in my odyssey than the Semi-Synthetic Penrite HPR5? This is especially when the Castrol is currently cheaper.

Also, apart from bringing the car back to Honda (I have a funny feeling they won't let me bring my own oil), does any member have any recommendations for a reliable service centre in WA that services Honda well?

Thanks in advance!