Busa251,
Everyone will tell you something different, and people have very strong opinions about what they like, and why they like it.
That being said, I like the K&N oil filter because it's built very well, and has a 17mm nut on the end, which makes it a piece of cake to put on and get off. Suzuki OEM is also a fine filter.
As far as oil, I'm using Spectro dino 10w-40 until I feel it's broken in, probably around 2K. Then I'll switch to full synthetic (Mobil 1, Motul, Castrol etc) I haven't decided yet.
Remember, it's almost impossible to find a poor quality oil these days. Pour in what makes you feel good, and enjoy the ride!
Best wishes, Tim