I have a Sony 50mm f1.4 and a Sigma 105mm f2.8 and these are both great for people shots and both come in around the £270 mark. There's also the Sigma 50mm f2.8 for around £200 or the Sigma 70mm f2.8 Macro for around £300. Then there's the well respected Tamron 90mm which is in a similar bracket to the Sigma 105.
So yes, the lenses will cost as much as or more than your kit, but then that's photography. You will always end up spending far more on lenses than bodies. See how you get on with your kit and then, when you're happy to, splash out on one or more of the above. They are all very good lenses at the cheaper end of the market.