>>3032066>Taking anything portrait relatedSEL50F18 - Solid, simple 50mm. Fast autofocus and OSS make it a pretty useful lens. 50mm works really well for portraits on crop, though some prefer longer. ~$200-300.
SEL55F18Z - One of the best ~50mm ever made, sharp as fuck, and great IQ. ~$800
>Architecture Samyang 12mm F2 - Fantastic lens. Manual focus, though that matters very little for architecture. Also great for astrophotography. $350
SEL20F28 - Native pancake. Decently sharp, and small as hell. Maybe a little tight on a crop. A damn fine lens I would like to buy, but way too pricey for what it is. ~$300.
Sigma 19mm F 2.8 - AF lens. Extremely sharp for the price. Many people swear by the Sigma lenses, but I have personally never used them for long. ~$150.
>Travelling in generalKit might actually be a good idea here for vacation snapshits. It isn't G Master quality, but it is decently sharp, quick to autofocus and compact as hell. Sure the distortion is an issue, but it can be fixed easily in post. The older kit is also an option. It is a little larger (pic related) but generally a better lens.
SEL18105G would also be a good choice. Rather large, but it covers a large zoom range and has above average IQ. See it as low as $450 here.
I am sure some others have recommendations for you of things I forgot or didn't think of.