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#41
Any SSD will fit your Inspiron 560. If you tell me what size SSD you want and what your budget is, I'll be glad to make some proposals.
You can get a 60GB SSDs for around $50, 120GB for around $70, 240GB for around $90 and 500GB for around $280.
If you use it only for the OS, 60GB or 120GB would be plenty. My 3 desktops run on 60GB models since years and I never ran out of space. Only need a little easy 'tuning'.