Uhm, are you a starter with DSLR photography?
So yes, first learn all the things on the 1000d before you move on to a pro camera. You really only will get less noise if you go to the 7D, not better quality as you use the auto settings.
If you want less noise, go for a brighter high quality lens, then you will get better images than when you fit the 7D with a cheap lens.
Id say: No go. But, maybe the D90 is nice, however, the D90 isnt a beginner DSLR too.
What made you think I'm a starter?
Also I never use auto, I don't even use auto focus lenses as I said in my post.
BTW I've some bright (and also quite sharp) lenses if you check my sig.
Glass doesn't age, just because they're vintage lenses doesn't mean they are any less good than the newer models except for the lack of auto focus or stabilization.