Raistline on 01 February 2010
I would go out and buy the BD -Drive and replace it yourself. It is not worth losing the backwards compatibility to get the slim.
Here is a site link: https://www.electronicspros.com/p-29-kes-400a-blu-ray-laser-for-ps3.aspx
There are plenty of YouTube video to show you step by step how to do it.
You don't need to worry about voiding warranty, as it is already expired.
If you need someone to do the work for you, I will for 25bux, if you pay for shipping and parts.
