Hi Geno,
dunno if you got sorted or even where to direct you for a supplier in NI , but I trust Bridgestone Exedras on my GL1800 over Avon Cobras.
The Avons last longer but are not as good in the wet (my opinion) while they're both fine in the dry.
Check out Ebay and there's plenty of choice there to help making your mind up, but reckon most tyres these days are just fine, just down to personal choice.