The are standard off the shelf speakers that came with my old aiwa hi-fi system but to me they sound good, they both have built in subwoofers at the bottom and 2 speakers at the top.
Ive connected them up to a Onkyo Hi-Fi Mini System
It would be nice to have small speakers that look good,
if it will cost £100s to just for size and look im not sure.
You don't have to spend £100s to get some good speakers.
Onkyo make some good kit, so the system you have should be a good base for connecting better speakers; unless you want to replace that too for maybe a smaller unit?
If you do, then a small T amp and whatever choice of passive speakers, or you could just get some active speakers that contain that have the amp built in.
You can do much better than those Aiwa speakers. I used to have a Sony stereo which I bought from Currys in the late 90s. For years I thought it was really good, until a friend open my eyes, so to speak. When I eventually replaced that with a stereo amp and some Wharfedale 9.1 speakers, I was surprised how average that Sony system sounded. Although it came with a mini disc deck, it certainly wasn't cheap at £450. Disregarding all that and going solely on sound quality, it sucked in comparison.
I assume the Aiwa speakers have some fairly large woofers for bass. You wont get the same amount of bass with smaller speakers, as it's a physical impossibility. Basically, the larger the woofer, the more air it can move and the deeper the bass is. That's why I asked about any size restrictions. Some people only have limited space, so that will affect the size and choice of speakers.
Also, people's expectations differ, depending on what they currently have. It would be hard to recommend what you should consider without knowing what you are looking for in the way of sound. Unless you are just looking for something with better all round quality, and you aren't too concerned whether it has deep bass or not.
If you have a Richer Sounds in your location, then you could pop in and ask for a demo on some speakers that come into the budget you are considering. You would be able to get an idea of what to expect from a smaller speaker and also a larger one. Whether a smaller speaker will be a bass light for you, or just right. If you don't, then I'm sure we'll be able to recommend some speakers for you to consider.