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If you're not in a huge rush, I'd suggest you skip flying, and take the train. Well, train + train + ferry. That way, you'll have the computer parts and monitor with you at all times, can keep an eye on them, can ensure that no baggage handlers throw them about it.
Booked a little bit in advance, it's actually not that expensive either, especially when you factor in that there's no checked / oversized luggage to pay for!
First up, you'll want to take the Eurostar to London. Journey time is around 2 hours, and tickets cost from about €50 (they go up nearer departure). If you're not starting your journey in Brussels, you'll want to book an Any Belgian Station ticket. That adds about €10 to a one-way ticket, but will give you a ticket from anywhere in Belgium on the train to Brussels to connect with your Eurostar. More details on the Seat61 Belgium page
Eurostar officially allow 2 large items plus one small one, of any weight that you yourself can carry. Unofficially, you can often manage a little more than that, but they may be stricter on the rules if the train is very busy.
The Eurostar will drop you at St Pancras station. You need to get to Euston station, which is quite close. See this question on the quickest way between the two. (St Pancras is right next to Kings Cross, on the Euston side)
From Euston, there are direct trains to Holyhead, and you can buy combined train+ferry tickets. These cost a whopping £38 one way! See the Seat61 Ireland page for details. It takes about 4 hours to Holyhead, then another 2-3 to Ireland, depending on if you get the fast or the slow ferry. There's some very picturesque scenery on the way.
On arrival in Dublin, you can take a bus from the ferry terminal, or probably you'd want a taxi given how much stuff you'll have
Not quick, but with the Eurostar booked in advance you can do it for under £100!
Upvote:11
I have flown from the USA to Thailand with computer monitors in my checked baggage without issue on a couple of recent occasions (and I use a roller duffel, so effectively zero protection against theft).
Most thievery from luggage is small, easy to conceal items like jewelry, cameras, phones, tablets, music players. A big monitor in its original box is too big to be casually concealed and carried past security at the end of the work day.
While the factory box is usually pretty good protection, I have always stuck some folded up clothing in the empty space between the screen and box, just for a bit more protection against crushing or penetration of the cardboard.
Your choice of airline or airport would have little bearing on this, as it would simply depend on which ramp rats were handling your baggage that day. Most airlines/airports have hard working and also lazy employees and it is just the luck of the draw whom gets to handle your baggage.