i always think you should try before you buy. if you wanna spend you're money, the shop should let you have a little go of them before you do.
always ask around your friends and get recommendations. if you go too cheap, you always end up thinking, if you spent another £50 you could of got the ones you really wanted, and you grow to dislike what you did buy. keep you eyes out for sales and bargains, you can get a chunk off if you do decide to spend big. the simple fact is, the lower you spend, the quality get lower too.