Depends on what you want: If you want a nice base go for a subwoofer, if you can get a set with its own amplifier it would be great. If you want a nice quality sound you might want to buy some smaller speakers for the same amount of money for example B&W DM303 speakers. Speakers like these have a great sound and if you want you can add an active base later on. (afterall 100 £ aint alot to spend on speakers)
