Hi.
As others have said try and test ride a few.Ive owned bot 996BP and 916SPS(996 c.c).
I would definately go for the SPS,R models if you can find the extra cash.The engines are in another league imho on the SPS,R models.Mine has covered 22,000 miles and has been fine apart from the usual rectifyer wiring fix.
If there is a problem then SPS,R model will be VERY expensive to fix if its the engine department as they use some very nice parts indeedy.Sand cast crankcases for extra strength that cost a fortune to make and pankl titanium con rods (£900 each)

.You also get 50mm full system with these bikes and P8 computer.
The 998 model is very nice but a bit pricey compared to 996 and you could probably get hold of a SPS for the same price.
Best bit for me is the SPS's rev to 11,000 rpm,my mates R1 redlines just after 12 not bad for a v twin then.
Have to agree bostrom replica is stunning in the flesh.Id have one or the bayliss rep.Loverly.