Go for 'IT Services'. The hyphen looks awkward and is unnecessary. Go for caps only if it suits the design.

My favourite is the top-right design, but IT SERVICES needs to be in a heavier face and with a little more spacing around it and the grey panel.

The drop-shadow on that logo looks good for a web page and on a white background reduces the sharp contrast between the blue type and the white background, making the image look less jaggy.

When it come to print, only keep that drop shadow if you're doing full colour printing at a high line screen (175lpi, ideally 200lpi) if you're doing cheaply-printed leaflets, newspaper ads, or laser print, get rid of it as it will just make it look blurry.