£5600 to invest somewhere

[egor110]

I have £5600 to 'put somewhere'.

I could stick it in nationwide isa @ 2% so £112 interest and no tax.

Or i could put it in santander 123 @ 3% so £127 but taxable at lower rate, but get money back for direct debits.

Or i could get £160 if i put in a halifax current account £100 reward for joining and £5 month obviously would then move it again in a years time.

Have i over looked anything?

I haven't filled up my isa allowance but is it really worth it with such a low interest rate?