DV Info Net - Canon XH-A1s / HV40 tapes for HD recording ?

With my first HD wedding looming, I am wondering which tapes to buy for the Canon XH-A1S and HV40 - many members here seem to have experience in recording in HD with these cameras.

I have learned that HDV tapes are not a necessity for HD recording - so can we just clarify: HDV - including 1080i and 25F modes (PAL) - can be recorded on both these cameras onto normal miniDV (SD) tapes?

From my research on the net this appears to be true, with zero difference in recording/output quality - the main reason for paying extra for dedicated HDV tapes seems to be for the worry of experiencing dropouts when using the 'less robust'(?) cheaper miniDV tapes. I'm aware that dropouts when recording in HD are more severe than with SD material, but I have read several testimonies from users who have recorded HDV onto miniDV tapes for years without problems.

So is it worth the extra investment to use only dedicated HDV tapes? If so which brand is recommended for the Canons?

Also is it true that Sony allegedly use a 'unique' kind of tape lubricant, and should be avoided unless sticking absolutely to that brand all the time? I know it is best not to mix brands anyway, but have read some odd reports about the Sonys...

Thanks for any advice.