Start by upgrading your head unit and using a amp also add new speakers than look at another amp and subs. If you are serious about something that can "keep up" you are looking for a full system and not just subs. Yes this will probably mean upgrading your budget however the end result will be much cleaner than just adding subs to a stock system.
Also are you installing yourself? If not your going to have to add cost for install from a installer.
You could do the fallowing:
Kenwood head unit "double din or single din?"
Alpine pdx5 amp for around 350-400 dollars
Polk db for 110 or upgrade to the polk mm for additional cost of 60
Sub and sub box total 400
Steering wheel controls? add 80
Install varies
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