I don't know where you dived off Ireland, but I've had some wonderful dives off the west coast. You may find if you go back after you're got a fair number more dives under your belt that you appreciate the area more.
Thanks for the advice re the nitrox.
I've been diving off of Baltimore (in Co. Cork, very south of the country, but didn't dive anything exciting like the U-boat wreck that's down there), Killary harbour (in Renvyle, Co. Galway) and in the Aran Islands (Inis Mor and Inis Meain). I'm sure that if I had the use of a drysuit and if the weather was a bit better than it would have been a lot more enjoyable. But I'm very prone to getting cold on dives where the water temp is less than 20 degrees and everytime I've been diving at any of the above sites there's been strong current and annoying surge. When I'm pretty limited with time, it's just not worth it for me.
Aquanauts Pattaya - thanks for the advice. I have been diving in Thailand before (Although not in Pattaya) and really enjoyed it, but I am looking for somewhere new to go to, since my future travel opportunities will be pretty limited once I start work full time. Plus I'm on a serious budget!