Good work mate. Proper appreciated. Have you not considered slimbean. The ROMs are only 80mb or so. But way more features than cm. Also have you considered building with sabermod toolchain. My experience is it speeds up a rom lots.
Coming from my s2 i can say the main differences between 4.2 and 4.3 is mainly under the hood. 4.3 is fast as even in this early stage. If you want a phone with the latest os buy a supported phone. I have just sold my s2 and am getting sick of flashing the latest build every day. Theres something to be said for stability. Saying that i will get bored soon and buy a nexus:D