Classics Jetfire was the first "modern" figure I bought back in '07, and it set me on the collecting path that I'm still on now. So, yeah, I have a soft spot for it.
Time has also not been so great to that figure. Articulation is kind of awkward, and it wouldn't even balance properly with the booster pack attached.
Siege Jetfire would be the natural replacement. It sure looks fantastic, but, he's just way too big for my liking.
So... I don't know...?
Classics Jetfire has all but ingrained it into my mind that Voyager class is the best size for him to stand as Starscream's eternal nemesis. So yeah, T30 and Siege Jetfire are both too big for my liking, and thus I will continue to wait for a nice Voyager-sized successor so that my sadly-yellowing Jetfire can finally retire.