haber, I bought the 205's. You can use the 225's. Z Factor explained it in my thread about the miss in my motor. Either one is okay as RC rates the flow at less PSI than GM. Six of one 1/2 doz of the other. If you plan on some major porting work & exhaust swap out w/ headers & gears & chip then the 225's might be better as there might be more for a tuner to work with.
The price I got was $64.00 each if I bought all 16 but I snuck in just before a price increase I was told. That was back in late Sept 05. I think the $68 sounds fair if you price them against the OE stuff from GM. I am satisfied but my stuff was shorting and leaking I found out after I pulled them out for a look see. I am very happy with my RC 205's as the car runs very well, to me anyway. I think that the injectors were also leaking as the secondary butterflys also had some gum on the top sides of the butterflys?? It just pulls smoother and feels more uniform after 3.5 K rpms.
Tom