Advice and recommendations for chiller

[phineasborg]

hi bros,
I'm thinking of getting a chiller for my 5x2.5x2(ht) ft ios tank - to set the temp at abt 25 degrees.

But I'm totally ignorant abt chillers, so need all your expert advice.

Have a few questions:
1) how big should the chiller size be, 1/2 HP, 1 HP, or?

2) based on (1) what are some brands that are considered fairly reliable, but also in the affordable range?

3) based on (1) and (2), what is the approximate monthly electrical costs? and where is a good place to buy the chiller? C328?

thanks in advance for all your advice.

cheers