Studio monitor speakers are the ideal choice for close listening, as that's what they are designed for. HiFi speakers generally perform better when given more space and volume, so they can fill the room with sound, with the listener sat further back.
Not everyone likes studio monitor speakers though for listening to music. Some people prefer HiFi speakers, even for close listening, because they find studio monitors lack excitement. Good ones are designed to be close to neutral, whereas HiFi speakers tend to have a more coloured sound. Some people prefer that, whereas some prefer the more neutral balance of studio monitor speakers.
One thing is certain, studio monitors will show up flaws in poor quality music. HiFi speakers are better at hiding those flaws.
The QA BT3's are good speakers, but are probably more of a multimedia speaker. They'd be an ideal choice for a kitchen or study, where you want music, but it isn't the focus of attention.
There are some decent studio monitors for around the £150 mark, such as Presonus Eris 4.5, M-Audio BX5 D2.
Tannoy Reveal 402 and JBL LSR305 are better again and are very good indeed, but both are a bit over your budget at around £230. Almost certainly worth spending the extra on though.
The problem when deciding whether to go for studio monitor speakers or HiFi speakers is, it's very hard to find somewhere you can go and demo monitors. Stores with HiFi speakers are much more common. With monitor speakers, you've got to buy them and send them back if don't like them.
