Cary SLP98L upgrades--yea or nay?

I like this venerable (and recently discontinued?) pre-amp and don't have any plans to swap it out any time soon. As I plan to keep it, I'm curious whether folks think that the Cary upgrade is worth it, and I'd appreciate any advice from those who have done it. (I know the F1 mods were popular.) Specifically:

-- They offer Mundorf MCap SUPREME EVO SilverGold Capacitors. Two versions, one with oil (+$20). I've read mostly good things about these. Do I want them--and do I want oil? 

--Hexfred rectifiers. I've read a couple mixed things about these. Are they an improvement?

--Kimber Kable ($150/input; I'd only do one input). Okay--I like Kimber Kable ... but will I hear any difference?

I'm sure there are other/better preamps out there, but I like this little guy and I'm not looking for recommendations or esoteric mods. If these upgrades are ... really upgrades, it's a modest investment and I'd be interested in hearing the difference. I'm also interested in trying out some different tubes, but I'll save that question for another day...

Thanks!