For UPS get the APC BR-1000 VA IN / BR-1.1 KVA ~ 4600/-, great PSU's for the price you will not get better, they are capable of driving your set-up for 15 minutes depending on load, but if you are 100% confident of your college's back-up get the APC BR-650 VA IN model ~ 2600/-.
Hope this helps, Sire.