I live in Washington, DC and I regularly bike a four mile commute. I wish I had ground-level indoor secure bike parking at my apartment, but I don't. It's either carry the bike up two flights of stairs, or lock the bike up outside (I lock up to a bike rack using the kryptonite evo-mini). I usually carry the bike inside, but sometimes I lock it up outside overnight. Sometimes I also have the need to lock my bike up for several hours at a time, say from 9 pm to 1 am if I bike to a bar or an event. I'm a bit paranoid about adding things like fenders, a rear rack and/or a front basket for fear that they'll quickly get removed by thieves. I see bikes stripped of parts all over DC.
I think I've deterred thieves from taking my seat and wheels. I replaced the quick-release levers with Onguard's locking skewers, which require onguard's patented tool to remove. I'm looking for creative solutions to deter thieves from removing fenders, racks, baskets, etc. I'm not going to invest $100+ in accessories that are likely to get stolen within a couple of months.
My ideal bike would have all accessories welded to the bike. I'd even buy a new bike if such a bike exists. Any tips or lessons learned would be much appreciated. Thanks!