I could really use some advice on deciding what camera to go for. I have until Tuesday to get a Canon Powershot SX150 IS that's on sale at £69.99. I've been using an old A460 until it stopped working, so it seems like a great upgrade, it's a compact with manual mode which is exactly what I'm looking for, but I'm a bit concerned about the 3.4 aperture size, since I've mostly used 2.8 before and I intend to do a fair bit of low-light work, such as taking long-exposure shots in dark areas. That said, the main use for this is likely to be cosplay photography and filming at expos, camping trips, and zombie walks, which this seems ideal for.
I'd like to check though if anyone can recommend a better camera for the money, I've found a used SX110 on ebay with less features but a 2.8 aperture, or an A550, again used with a 2.6, but since those are both older models I'm wondering if the SX150 has better technology that can compensate for the smaller aperture? or does it just mean I'll need to give it a few seconds longer to expose in dark areas?
Thanks in advance for any advice you can give.