New here. CAAD9 project

[najibs]

Hi All,

I'm new here. I picked up this lovely Cannondale CAAD9 R5. I believe it's a 2008/2009 model. Seems to be all original. Got it from the original owner for a great price, who says he used it less than 5000kms.

It's in beautiful condition. I bought a chain wear took and it definitely needs a new chain, but all the other components (except tires) seem to be almost mint.

I'd like to make this a project bike, as it's not my main ride. Since the cranks, derailleurs and group set look mint, I'm leaning towards keeping it all original, mostly, but still looking to hear opinions on what to do to the bike.

I'm leaning towards putting some DT Swiss Spline 23 wheels (1550g) to replace the Shimano WH-R550 (1850g) and new lighter tires like Schwalbe One 25C, replace the old brakes with Shimano 105 BR-7000. In other words, with a $800-1k budget, I'd like to see how much I can change.

Current seatpost is almost 300g. I'm thinking of those carbon seatpost a on AliExpress that are 150g and like $50. Could probably use a new saddle too.
For thé Chain, is a KMC x10 ok or at double the price is the X10SL worth it? The difference seems to be a very marginal 15-20g.

I'm open to ideas and suggestions. Again, I don't want to sink more than $800-1000 on it. I want it to be a budget build with a few pounds shaved where possible, mainly to replace worn and aging components on this 14 year old bike.