I have a Suzuki GS150 since May/June 2008, it came with DENSO U24ESR-N. I used an NGK CR8E after replacing the perforated carburettor diaphragm. It was not as good as the Denso U24ESR-N. So I bought Denso from Suzuki Showroom and it is much better. I am not saying Denso is better than NGK, its just my observation that in Pakistani markets NGK has multiple levels of quality and fakes, whereas Denso doesn't. You should buy it from Suzuki showrooms only, with SGP logo on the cover.
From: Spark plug cross reference
Possible spark plugs for NGK CR8E:
Denso stk 4126
NGK stk 1275
Yamaha 94701 00330
Edit: Sorry, I didn't check the original post date.