I would go with the Dell route, particularly if outside Dublin. The support and warranty is local and transparent - even if im not their greatest fan myself!
The difference in price with the Aldi/Lidl/Tesco deals etc is fairly marginal, and I would be slightly nervous about warranty and repair, like which checkout in Tesco do you go to with a damaged PC?
You can buy a decent dell from under 900euro if your are not into gaming.
good luck!