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You paid $39 for the K&N air filter? I have a 00 GSR, I don't know if there's a difference between the air filters for the older models, but what year/model do you have?
take a look at ebay my man theres a ebay store that sells em for 30. I got mine through em
they are selling K&N OEM replacements, which you can buy for 30 dollars on most K&N autorized sites. The 60-75$ that some people pay is for a K&N performance filter, which slides right into the stock airbox, and is great performing than a OEM replacement.
V2 has bigger pipe, AEM short ram is small ass pipe... so I would go either CAI or V2. I have CAI on my teggy right now, works excellent for me, VTEC sound hella good!!
I have the aem cai on a 95 gsr with dc headers. mostly feel a gain at the top end with a loss on the low end, unlike short ram I had before which gave a good feel througout the powerband. which one actually makes more power hard to say and probably depends on other mods but cooler air into your motor seems to be agreed as a plus in most articles out there.