Id buy the bar, then save up a while for a good set of 4 lights on the top. I'd do the rear facing lights last, as a third stage.

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03, XLT, FX4, Ext Cab 4 Door, 4.0 SOHC, Auto Trans, K&N Drop in Air Filter.
Ext: Big Country Brushguard, Spray in Bedliner, Century Fiberglass Tonneau Cover (Not on at the moment), Aux Reverse Lights, AVS Window Deflectors.
Sterio System: JVC Deck, Hertz Door Speakers, Sony Xplod Slim Series 4 channel 500 Watt Amp.