Sort of illogical to say that you'd be wary when you obviously don't know the first thing about their after sales service on computers and other goods...
See for information about their general warranty cover and for details of cover on computers/IT gear.
A lot of the bigger Aldis seem to keep a stock of good value 19" lcd monitors in stock. The most recent ones I've seen are quite good. Price is pretty good too I think somewhere in the 200-300 mark (that may depend on the monitor size too).