As I stick to the smaller aircraft, GA & 19 seat commuters etc, and these usually have a lower price than the airliners, I’ve restricted myself to one aircraft purchase every 2 months, max. This way I’m also somewhat forced to actually fly my newest purchase rather than moving on to the next in a flash.
Saying all of that, PMDGs 777 will be a day 1 purchase for me.
Also, I tend not to buy scenery at all, unless I have a specific connection to it in real life. (Come on Orbx, time to port YBCS to MSFS🙏).