Need help buying/upgrading a PC to run UE4

[toxicesophagus]

So I’m trying to buy a decent desktop PC to run UE4 for some basic messing around; nothing too major. I’d like to spend no more than $900 for everything, but I’m afraid if I go the build-your-own route, then I’ll max that out and not have enough for a monitor/keyboard/OS etc. I’m wondering if it’s feasible to buy a bundled computer and just replace anything that needs upgraded. I really know very little about the hardware or where to start looking, but Walmart (the only place in town with computers) has some fairly inexpensive all-in-one PCs. There’s the HP Pavilion 22-a113w for only $450, but it only comes with 4GB RAM so I’d have to up it to 8 or preferably 16GB. The CPU is an Intel Pentium G3260T with 2.9GHz but only 2 cores when I think I need 4? I’d also need a good graphics card, but I’d have at most $450 leftover for those (but the less I spend the better of course). There’s also the Pavilion 570-p013wb for $550, with 8GB RAM and a better intel core i3-7100 CPU, but unlike the first it doesn’t have a touchscreen monitor which I’d really like to have if possible. I don’t know about the motherboard or PSU for either (or how important those are), but I don’t want to drop ~$500 only to need to replace everything. Is any of this doable? I know it’s a lot but if anyone with experience can help out or point me in the right direction, it would be incredibly appreciated.
Thanks ^v^
Pavilion 22-a113w: https://www.walmart.com/ip/HP-Pavilion-22-a113w-All-in-One-Desktop-PC-with-Intel-Pentium-G3260T-Processor-4GB-Memory-21-5-touch-screen-1TB-Hard-Drive-and-Windows-10-Home/46429960
Pavilion 570-p013wb: https://www.walmart.com/ip/HP-Pavilion-570-p013wb-Desktop-and-23-Monitor-Bundle-Intel-Core-i3-7100-8GB-Memory-1TB-Hard-Drive-Windows-10/55470367

 

[SliceT]

You would way better of doing it yourself..

PCPartPicker part list: https://pcpartpicker.com/list/ymcxzM
Price breakdown by merchant: https://pcpartpicker.com/list/ymcxzM/by_merchant/

CPU: AMD - Ryzen 5 1400 3.2GHz Quad-Core Processor ($156.28 @ OutletPC)
Motherboard: ASRock - AB350M Pro4 Micro ATX AM4 Motherboard ($74.49 @ SuperBiiz)
Memory: Team - Vulcan 16GB (2 x 8GB) DDR4-2400 Memory ($119.99 @ Newegg)
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive ($89.99 @ B&H)
Video Card: Zotac - GeForce GTX 1060 6GB 6GB Mini Video Card ($275.99 @ SuperBiiz)
Case: Rosewill - FBM-X1 MicroATX Mini Tower Case ($26.99 @ Amazon)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($43.98 @ Newegg)
Monitor: Asus - VS239H-P 23.0" 1920x1080 Monitor ($110.30 @ Amazon)
Keyboard: Cooler Master - Devastator II Wired Gaming Keyboard w/Optical Mouse ($25.59 @ SuperBiiz)
Total: $923.60
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-08-26 18:00 EDT-0400