Streaming to a Naim Amp

[shep1968]

Hi all. I currently have a Naim 5si amp and CD combo with Kudos X2 floorstanding speakers and am thoroughly happy with the sound. I've been streaming with an apple airport express without an external DAC but this has now died and i would like a replacement. I was streaming directly from my iphone with cd's ripped at apple lossless and more recently from Spotify. I'd rather not spend too much and have seen the Wiim mini which seems to fit the bill although is below what I'm prepared to spend. I'll still buy my favourite albums on CD but what else would you all recommend that is small, easy to use and realistically priced please? Top budget say around £300 max but happy to spend less. I'd rather not go for separate streamer and DAC unless the sound quality is going to be dramatically improved. I do have room for a CD sized option on my current rack but again would rather not unless i have to.