First off, you dont need a 450 for your first bike.. If you got the chance to sit on one, you'd understand. Second, that old 80's XR was heavy because thats how old dirtbikes are. You should look up the specs (weight) on the old 80's XR and then check the weight on some newer bikes to compare.
There are two general types of dirtbikes, and that is racing and trail. Sometimes its hard to tell what kind of bike it is without reading into it. Basically a racing 125 will blow the socks off of a 200 trail bike.
If I were you, I'd get a 125 racing bike or a 200 or 250 trail.
I've been out of dirtbikes for a while and I just got back in with a 2003 KTM 250 EXC. I'm only 5'7 120pounds, so I have a lot of getting use to i'm afraid. Good luck with your choice and read up a lot before you drop your hard earned cash.
There are two general types of dirtbikes, and that is racing and trail. Sometimes its hard to tell what kind of bike it is without reading into it. Basically a racing 125 will blow the socks off of a 200 trail bike.
If I were you, I'd get a 125 racing bike or a 200 or 250 trail.
I've been out of dirtbikes for a while and I just got back in with a 2003 KTM 250 EXC. I'm only 5'7 120pounds, so I have a lot of getting use to i'm afraid. Good luck with your choice and read up a lot before you drop your hard earned cash.