I am looking at investing in my first high quality lense.
Brief background: I started out with the kit lenses from my film RebelX (kit lense and Canon 75-300mm f/4-5.6 II.
I still use the 75-300mm with my Digital Rebel (300D) for sports and can live with it for now. I replaced the kit lense from my RebelX with the SIGMA 18-50mm f/3.5-5.6 DC. I am happy with this lense as it gets me the original FOV I had with my film camera. The quality is okay for now but my images often lack the 'punch' I often see from the many 'L' users on the forum.
I am most delighted with my thrifty 50-Canon EF50mm f/1.8 II. Crisp shots with superb DOF and very fast indoors. This is the direction I would like to continue.
Soooo, as mentioned, I would like to shoot with a higher quality lense but I want to fill in the fov I am missing in my lenses: between 50mm-75mm. I think this would accomplish several things:
After a little research I am seriously considering:
Sigma Zoom Wide Angle- Telephoto 24-70mm f/2.8 EX DG Macro DF
This lense us about $400 US (budget is flexible, but would like to stay sub$700)
I would like a fast lense (low light/good depth of field) but if I'm going to spend the money, I want excellent quality. I think this would be a super lense for formal portraiture as well.
Please offer you opinion/advice/experience with this or similar lense.



