Hi Simon,
I think that once you have decide on the brand of SLR you like, the glass on the front becomes ever more important. Especially as its an investment that can attach to newer camera backs as you progress and as technology for sensors etc improves.
I only use the Canon L series lenses - they are quite pricey (so are the Nikkor equivalents) but even on an entry level (not suggesting that yours is that) you can tell the difference. So invest in lenses and treat the cameras as something to be replaced from time to time.
The ting you tend to find with the cheaper OE or aftermarket lenses (Sigma Tamron et al) is that while they are adequate, what you miss is them being better than adequate - so they tend to be slower to focus, or spend more time 'hunting' for the focus in more difficult conditions (poor light, or low contrast scenes). Also, they are more likely to suffer chromatic abberation at the edges of a shot, or just plain old distortion.
Gimp is fine - I'm a Linux chap through and through, but occasionally fire up windows where I have Photoshop, and PS is more capable than GIMP - and benefits from 32 bit picture editing, whereas GIMP is 16 bit. But, unless you are preparing prints for billboards, or top quality glossy magazines you wont spot the difference in the final result.
Gimp also benefits big time from being free!
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