www.sunmaster.co.uk - I've booked a couple of holidays through them and it's pretty good although it always involves a phone call to finalise everything.
http://travel.sky.com/ - Booked a great holiday in Turkey a few years ago with these, no complaints
The classic
www.lastminute.com/ - I've used them a lot and got some great deals over the years.
I find expeida to be expensive and the thomas cook or thomson sites are fine but I find using something like sunmaster normally means you can get better flight options.
Hope this helps
Oh and I would avoid a lot of the icelolly (www.icelolly.com) type places because they normally advertise great bargains but by the time you've spent an hour wading through all the options the deal has mysteriously gone, or is only available on the 3rd tuesday of every month with an "L" in its name and if you are shorter than 5ft 8" with Black Hair and green eyes etc...
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