If you're concerned about home safety, then it can be wise to purchase a security metal door if you're looking for a replacement door. A metal replacement door needs to fit your structure and your measurements perfectly, and in order to enhance security, it also needs to be built well, and of course it doesn't hurt if it looks good as well. You have a couple of different options regarding this purchase: you could either invest in a new front door such as this one: 
Therma Thru Steel Entry Door
"Our 20-minute fire-rated doors are available in five ready-to-paint decorative designs, with tough 24- and 25-gauge smooth steel and polyurethane foam core for durable energy efficiency. All doors feature a solid wood lock block for secure mounting of hardware, decorative glass options, and a five-year limited warranty." can be found at thermatru.com This is great if you want to replace the whole door. If on the other hand, you were simply thinking about increasing security and you want to keep your old door, then perhaps a screen door such as this one would be a good idea: 
Grisham Protector 32 In. x 80 In. Steel Security Screen Door, Black Finish, Expanded Metal Screen
"Expanded metal security screen door. Pre-Hung and pre-hinged for easy installation with no drilling for hinges. Double bore lockbox fits most 2-3/8 in. backset locksets (lockset not included). 3/4 in. x 3/4 in. welded 18-gauge steel frame." can be found at homedepot.com A security screen door would certainly provide an extra layer of safety between your house and the outside world, and it can add some style as well. So no matter what type of door you're looking for, you're sure to find something that is appropriate for your house.
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