Should I switch from Straighttalk to Boost Mobile?

I really want a touch screen android phone, off contract. I was looking at the lg optimous q with Straight talk for $179.99, and was thinking about getting it. But tonite, while looking at Black Friday ads, I saw a boost mobile Samsung Transform Ultra for 114.99, but I'd have to buy a unlimited service card for $55.00, add tax and I lose money because its cost more to switch carriers. Is boost mobile's service good? Is the unlimited plan nationwide? lastly can I download free ringtones? Thanks!
 
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