My superduty is the first Ford vehicle between myself and my gf that didn't have melted plastic connectors on the back of the bulb. Her escape's connectors are melted right now (still function 100%) and it's only had the original Ford bulbs in there... I see this a lot actually. This truck still hasn't done it, even with my HID's in, but my rangers all did it before too.
My buddy has a ranger for his winter rat, and we both bought HID's at the same time. He ended up pulling his out because they just scattered too much in the stock ranger housing and he was getting too many people flashing him, so he did some research for the brightest non HID bulb he could get and he ended up getting.
Ok I lied, he got them for his new TDI, said he ended up putting basic silverstars in his Ranger, but here's what he told me:
I bought them for the TDI. Ranger still has silverstars in it. I got these Philips Xtreme Power bulbs:
I picked a pair of 9007 bulbs up new on ebay for about $30.
There is a brighter version of the Philips bulb that has come out since that one (“up to 100% brighter than standard halogen”), but you will get more life out of the “80% brighter” versions I bought from what I read. Here are the 100% versions (Xtreme Vision):
Car Bulbs › Philips X-treme (Extreme) Vision Car Headlights | PowerBulbs