Giving the budget helps, but you need to tell us what headunit you have and what kind of music you listen too. If you have no intention of fitting a sub, you may want a set of components that handle the lows well. Are you after out and out volume or SQ? I would also put all your budget into fronts, rather than spreading your budget over front and rears. Also, are you amping them up or just running the comps from the headunit? If your spending 150, you should really amp them to get the best from them. IMO 150 quid speakers running from an aftermarket headunit is a bit OTT.