Not an upgrade as such there's a decent one on I was going to replace but after finding the goldring e2 for 30 £ couldn't turn it away.
I've supposedly upgraded the amp to an acram sa30 lately after having two faulty roskan k3s but I lie to myself its better than the pioneer a400 it replaced (which I still use) with mission mx3s.
The exhaustive connectivity of the acram is a plus and power is far beyond most amps, the roskan at a rated 140w is no where near the output of the acram which matches my listening habits.
I still use a separate streamer though as I've always liked the ifizen blue air for Bluetooth
Also I upgraded the speakers from mission 763i to q acoustics 3050i which are as reviewed and very capable speakers.
I've also got myself a Yamaha rs202d for my second set after being surprised at the quality at the price which I got for 229 £ in a sale although the inbuilt Bluetooth receiver needs sidestepping and it's 100w claim massively bolstered it's a happy amp and dab, very colourful sound even when pushed.
It proves that budget hifi is obtainable and usually a cheaper option than those all in one things from Currys and Argos etc.
I'm still building my new hifi after getting the acram and speakers I've repaired my old favourite cdp being a Marantz cd 52 mk2 I haven't heard better in its original price range.
I recently auditioned the Marantz pm 6007 and it's not a better sound infact I still prefer the cd 52 so replaced the ejection wheel a common inherint fault with those players.
I decided to get a wharfdale SW 150 subwoofer but it remains switched off as although it being good at what it does the hifi sounds better with the 2 main speakers alone.
I might use it for the occasional movie.
But you have failed to tell us what amp, or is it a secret? 
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