Hey guys wondering if you can help me?

I have recently came across Flyertalk after doing 10 US Airways flights to/around USA, and decided to start saving avios.

From that trip I somehow got 320 tier points ( i read they where doing a bonus from the OW merger with AA.) anyways myself and partner have booked a trip to Punta Cana in May WT+ from Glasgow (upgrading to CW with avios) earning us another 220 tier points.

I only need another 60 points by Sep7 th to get silver. We really want to go to Venice around June time.(think its 60 points each way) Maybe its me but to go business from GLA is costing around 500 each for 4 nights in a 3 star hotel with bad flight times through BA.

can anyone suggest any cheaper alternatives?.. can I book one way economy, and another business.

any help would be appreciated.....

P.S. is it normal to be addicted to these sites and trying to save Avios???