I would buy a Nikon equivalent body, and if you really want a prime 50mm lens, then get the 50mm f/1.8 G-series for around $225. It has aspherical element design and a modern, high-grade ultrasonic motor and really excellent optics. The 18-55 kit zoom is not very versatile, and a 75-300 on a crop-frame camera is just wayyyyy too long for indoor use. Which is a large part of why the bundle is a bad fit for a boudoir shooter...18-55 is basically "meh", and 70-300 range zooms are for outdoors use in decent light. Canon's 50mm f/1.4 is a lovely lens--it has nice bokeh and good optics. But not the same with their 50/1.8 EF-II...it has ugly bokeh and bad focusing behavior indoors in lower light...loud focusing, and frankly, I found mine unreliable, and irritating, in indoor focusing situations.LIke the old song says, " Dzzt-dzzt-dzzzzt-dzzzt! went the cheap low-grade focusing motor, as it struggled to find focus!"
Anyway...there are a lot of cameras on the market. I hope you can find a legitimate good deal. I find it sad to see all these awful "kits" being sold so widely. Honestly, I think you ought to reconsider the need for a 50mm and save the money, and apply the cost of a good 50 toward buying one better,more versatile zoom, like say the Nikon 16-85mm, specifically, so you have the entire needed range in one good lens, and not two "kit" zooms.