Couple of comments on your selections. I've always used HKS and probably always will. Every time I've heard of problems with cams, they're from other companies that regrind. Plus, every time I've heard of someone degreeing HKS cams, they've always came out spot-on straight from the box, which is not the case with other cams.
I think 264's are extremely mild. I've run 264's straight, 264/272, and 272's straight in my gsx and I liked the 272's the best. No real idle issues with a decent tune and they simply pulled great. I just finished putting 272's on my evo with adjustable cam gears (first time I've had used cam gears) and it seems to be idling fantastic at -4/-1.5. I drive my cars on the street and hate bad idle issues, lag, and hesitation as much as the next guy, but I've honestly never thought that a decently aggressive cam necessitates forgoing driveability.
I definately wouldn't say you need cam gears, but I do think it's worth the extra 200 to get them, particularly if you're going to dyno tune the car. Plus, if you ever decide to degree the cams it's necessary.
I think 264's are extremely mild. I've run 264's straight, 264/272, and 272's straight in my gsx and I liked the 272's the best. No real idle issues with a decent tune and they simply pulled great. I just finished putting 272's on my evo with adjustable cam gears (first time I've had used cam gears) and it seems to be idling fantastic at -4/-1.5. I drive my cars on the street and hate bad idle issues, lag, and hesitation as much as the next guy, but I've honestly never thought that a decently aggressive cam necessitates forgoing driveability.
I definately wouldn't say you need cam gears, but I do think it's worth the extra 200 to get them, particularly if you're going to dyno tune the car. Plus, if you ever decide to degree the cams it's necessary.