Streamer to pair with vintage SAE 2500 MK 25 Stereo Power Amplifier

Hey

I'm a bit new to the hi-fi world so I thought I'd see if someone could point me in the right direction.  I have a vintage SAE 2500 MK 25 Stereo power amplifier that has just had some TLC so is in top shape.  Connected to that I've got some big ass infinity qls 1 speakers that have also had some TLC but a couple of years ago.  

Now I've got an SAE preamp which is in need of some updating and that's where my question comes from.  As the pre-amp is also vintage it doesn't offer much of modern input options (although I've got it hooked up to Apple Express for Air Play) so I'm thinking I should just replace that with a streamer, most of the music I play comes from a streaming service anyway.   My question is, with this kind of power amp, what streamer should I be looking at (mid range budget wise) and do I need to look at a streamer as well as a pre-amp?

Hope it's ok to post this kind of question here.

Cheers

Joe