Modding my Lehmann Black Cube Phono (advice needed)

[Funnyx]

So I just received my second hand Black Cube Phono (06 edition) and although it sounds great, I would love to mod it a bit and make it sound even better...

I've read quite a bit on the whole opamp rolling thing on internet, but most of those posts are older or not relevant to this phono stage. I'm sure there are a few experts here that can help me out...

So we're talking about a THAT 1510 Preamplifier and a Texas Instruments OPA134PA Audio Amplifier. The main thing is to replace the opamp, but if there's a good reason to replace the preamp, I'm fine with that. I've got a few 8 Pin DIP sockets coming in.

I also got two OPA2107AP's coming in, but can I up it even more? Like say two Burson V5's or better?