Personally I very rarely buy computer products from the local shops. I prefer on-line & the media I refer is available at SVP . They also do a reasonable range of DVD writers.
The Philips they do there is actually a Liteon and for Â£20 is an absolute bargain. Also the Pioneers are pretty good.
So if you can order online then SVP is the place to go.
Going back to the topic of your post. Many currently recommend the LG4167, Pioneer 110D, NEC 4551.
BTW Verbatim 4x DVD+RW/-RW should be available at PC World, Staples etc.