My advice to you is to try and get your thinking clear on what youre looking for...
for example; do you want to be as near to work as possible? If so, then areas such as Clonsilla and Blanch are probably out of the equation.
If house size is the most important then obviously the further you go out of town the more sq. footage you get for your money - if so D15 is probably right for you.
Is a house or apt. best for you? Cabra, Crumlin and Ballyfermot don't have alot of apts - compared to areas such as Blanch, Clonsilla etc.
Are you willing able to consider buying a run down house and doing a refurb? If so, theres lots of these in former corpo. areas such as Ballyfermot, Crumlin etc.
Best thing you can probably do is go out and view as many areas and homes as possible to get a general feel of what each areas offers. Once you've done that you will start to narrow the search down as you will realise that you could never be happy in some of the areas you mention. Then you can start to worry about the actual property..
Crucially if you are considering an area you need to see how the area is at different times of the day eg if you view on a Sat then the traffic volume will not be large in any area - it will of course be very different in that area during rush hour.
If you do opt for an area you should be careful about which estates, streets you go for... theres lots of good, bad and ugly areas in most of the neighbourhoods you mention.
In case its relevant I bought a house in Lower Ballyfermot about 7 years ago and also looked in Drimnagh and Crumlin during my search... so I know these areas reasonably well - give me a shout if you want more specific advise on these areas. Also there are lots of threads on all these areas within these forums.
Best of luck - remember you're in a buyers market