have a limited budget. [snip]
We replaced our wooden front door a few years ago (it was warped) and chose to replace it with another wooden door. Close friends replaced their door a few years prior to this and chose a uPVC door - it looks pretty chunky but looks are deceptive. The problem with the friends door is that the frame was uPVC too (or so it seems) - resulting in a terrible job. That's what caused us to stick to wood for our replacement.
Regarding security, I'd advocate a mortice lock in the middle, a hand operated turn-buckle bolt at the base (without key) AND a nightlatch fitted higher than the mortise. The nightlatch's keeper fits into an electric strike release. Keypad outside the door too.
Thus: at night you can have the mortice AND the nightlatch AND the deadbolt securing the door. When you leave the house empty during the day the nightlatch and the mortice are used. When you are in the house the nightlatch keeps any old punter out but lets in people that know the keypad number. If you provide any kids with a door key there is less worry if they lose it because anyone finding the key and knowing which door it is for still has to get around the keypad mortice.
I bought a twenty-quid door closer from Screwfix to ensure that the door is closed automatically after use.
Next idea (when I get time) is to employ the services of another solenoid which will be energised via a simple timer circuit to keep the door open for (say) five minutes. Enough time to unload the shopping without wedging the door open permanently then forgetting about it.
The other idea regarding the "Door Sentinel" is in final stages on my electronic breadboard... :-)
HTH
Mungo