That'll depend on how soon you manage to acquire 60 GH/s and what the difficulty is by then.

At today's difficulty, that should get you approximately a block every 16 days.  In that case I might be willing to accept the risk of coming up short in exchange for the possibility of coming out ahead.

You'll want to keep an eye in the difficulty and be ready to switch to pool mining if it increases to much.  Perhaps have a pre-determined point that you decide will be the value forcing a switch to pooled mining (anything over 36690000 is going to push your 60 GH/s out the more than a month per block on average).  Perhaps if any two month period goes by and you haven't found at least 2 blocks, then maybe its time to switch to pooled mining.  Personally if the difficulty was over 36690000 when I received a 60 GH/s miner, I probably wouldn't even attempt solo mining and would go straight to pooled mining.