Humm…
You are going to be struggling I think, diesels are only just getting popular here in the last 5 years or so and unless you go for a really new car they don't have the smaller diesel engines, they are all around the 2 l mark..
I've imported twice from the UK but even then it's expensive because of the VRT (there is a calculator, at the lower end your still looking at 500 yoyos to add on and then there is the cost of the ferry – choice in the north is quite limited).
Most of the smaller (and older than your 8 years) petrol cars (ireland is famous for having cars with the absolute smallest engine possible in a car) are stuck around the 1000-1500yoyo price (rip off basically). Because they are older than 2008 when the emissions law came into effect they still have engine size tax – there isn't a massive drop in tax from 2L to 1.5L say.
To avoid/reduce the tax you need a 2008 irish car or a post july 2008 UK/EU one – so you have to spend a load to save a bit (not worth it).
With your budget you'll be struggling to get a <8 years old car, scrappage has pushed the already artificially high price of old small engined cars up.
How bad is the Pug? I'm currently running a 200SDi that would last you 2 years before the tinworm kills it (it's being replaced with my dad's car once he sells his house).