Yeh mate, won the league first season (by a point!)- though i was pretty fortunate with injuries.
Sort out the DM and LB position, and get another creative attacking player to shift the burden off Cazorla's shoulders.
Also, keep the formation simple, a 4-2-3-1 works well if u can get that creative attacking player, cos u can play with 2 direct players (2 of theo, pod or giroud), and 2 creators (cazorla and other high- creativity/technique player), which gives a good balance...
I got Naingolan for 10, Alaba for 15 and Gotze for 29, selling Mertesacker, Santos, Arshavin, Diaby and Chamakh.
Oh, and keep tweaking ur tactcs a little, small things such as changing ur offside line when u play against the crazy- pace of Spurs is vital this year...