Recommended gyms in Blachardstown area.

Apologies to mods in advance - but this is kind of separate from the other thread, insofar as I'm specifically looking for advice on gyms when I do soon make the move to Blachardstown.

Basically - I'm pretty out of shape and overweight, and I will soon start work in an officer job, so I will really need to get into a good gym routine to try and get me back on track. However, I know pretty much nothing about gyms, so could do with some pointers about which gym in Blach might be a good fit.

The two I was thinking of were Westside Gym, and the Ben Dunne gym in the centre area. Westside gym is slightly nearer to where I will be living, but after checking the prices, Ben Dunne's is quite a bit cheaper, especially for the 12 month membership.

If anyone has expirienced either of those places - how did you find them, and were they good value for money? Also - feel free to suggest other gyms in the area that you think would be worth looking into!