Hi Ankush, My suggestion would be to setup base at Kasol with Om Negi's camp. It's a beautiful place surrounded by mountains and on the banks of river Parvati.
One of the days you can go to Malana and another day you can go to Tosh.
When in Kasol you can also visit Manikaran for the hot springs. Contact Om Negi if you need. He's a helpful guy. P.S. Here is the link: http://www.negis-kasol-malana-parvati.com/