While you are considering the hardware you are welcome to borrow my SDR to give it a go and see how you get on with it, if you would like to. It’s VHF and UHF only at the moment, control software and the drivers, and other advice is freely downloadable. It might give you an idea of activity in your area on 4m, 2m and 70cms? Drop me a pm if interested.
One issue you may have with HF listening with an indoor antenna is interference. Even with an outdoor HF antenna many people are plagued by it. There are many, many potential sources and often it makes hearing anything but strong signals difficult. My laptop power adaptor is the biggest culprit in our house!
I find using a web SDR can be very useful when signals are difficult to receive on HF. There is a list of them
HERE. Try some of those in Ireland - they can have a very low noise floor.
All the best,
Martin
G4NCE