My entry-level road bike came with a Truvativ bottom bracket cartridge w/ square tapers, its been creaking a little so I want to replace it.

I know I need to get the correct length cartridge, but I know nothing about which makers/brands are good for the money.

So far all I know is I can pick up a replacement Truvativ for like $12 or a Shimano BB-UN55 for $25... Is there any others I should be considering or should I just grab the Shimano and not worry about it?