I find a G3240 for my dad is just fine, he does accounting and general office flim flam also and it's nice
The SSD makes all the difference
I wouldn't go for that PSU, it's not a good quality unit, especially in comparison to the SuperFlower one stulid chose
Also the b-grade cases you might find could be iffy... but maybe you'll have good luck(could just be a DSR return)

I believe it'll just be eM Client, Chrome, Word, Excel etc. Account's are done online.Are you going to run accounts software like Sage, Moneysoft or just excel?