A guitar not staying in tune has one of two things...
1 - Malfunctioning hardware.. Take it to a tech if you can't figure it out..
2 - an incompetent player..
Sounds to me like you need to educate yourself a bit more on WHY it won't stay in tune rather than whipping out the checkbook for another guitar (that likely won't be any better than this one once you get ahold of it...) Not trying to be insulting, just honest and save you some wasted $$$...
Agree, In my experience some budget guitars I've had won't hold tune as long
sitting on the stand or in the case as a better quality guitar.
Quality of the wood maybe, not cured as well?