Switching to a new case for a prebuilt computer

Damn, that's a shame. I'll look into replacing my GTX or finding a good deal on a case, mobo, and psu.

Thank you.

Thank you for the input, xPhaze. I did some thinking, and have decided to buy a case, PSU, and a mobo. I saw various deals and believe the overall cost will be less than $100. I'm fine with such a buy as long as the case and PSU last me for ~4-5 years.
Below is what I intend to buy. If anyone could give their thoughts on each of the parts below, it would be appreciated.

For the case, I have decided to go for an ATX Mid-tower one. I'm aiming for a case under $50. This is my preference for now. It's about $48 on Amazon. A mid-tower case should be able to accommodate most computer parts, as I read online. I know for a fact that I'm never going to go the SLI way so I'll always use only one graphics card at a time. Do people tend to change their cases very often? If not, then I believe a mid-tower should last me 4 years easily. If anyone has better recommendations, then do tell.

For the motherboard, I'll be happy with one that lasts me even a year since I only need a temporary one (LGA1155). Trying to go cheap on this (< $30). In a year, I'll probably invest in a new CPU, so I'll need a LGA1151 one, and I would rather invest at that time than now. Ebay seems to have some good deals on this. I found the Dell Y2MRG for about $25.
Compatibility: Case: It seems that it's a micro ATX mobo, so it should fit into my ATX case.
RAM: It has DDR3 SDRAM. My prebuilt also has DDR3 RAM so I should be able to use that.
GPU: It has 1 PCIE x16 slot which should be sufficient for any graphics card I decide to buy.
HDD: Has SATA ports so my Seagate HDD should be fine.
I think that's all I need to be worried about.
An alternative is ASUS P8H61-M LX but it's $39. I'll probably go with the $25 one since I can't find any major differences.

Finally, the PSU. I'm going for this (550W 80+Bronze for $35). Recommendations are welcome.

I bought my 1050 Ti for $160 and the MSI version of it is already down to $130 so I believe prices will go down even more. I'll probably switch out the GPU with a 1060 3GB due to the drop in prices around Black Friday. Would the 1060 be compatible with the PSU I intend to buy?
Total: 48 + 25 + 35 = $108 (Yay for free shipping). Some Black Friday Magic can bring it down to less than $100 and voila.
Sorry for the long post and thank you!

Thanks for the input again. I asked a friend yesterday and bought the Asus one already, because he said I shouldn't go with motherboards from other computers and that the Asus mobo should be compatible with the other components I am going to buy. The deal was ending soon so I kinda panicked and just bought it. In retrospect, I should have bought one of the mobos you linked to.

For the case, if it's as you say, then I'll definitely wait for better deals. Now that I know the PSU is decent as well, I'll simply wait a bit for that as well. I intend to keep the case and PSU for quite some time so I definitely want to get a decent one.
Fingers crossed for the 1060 going down in price. I already saw a bunch of them go down to $185-188 so should go down a bit more by BF/CM. It seems I'm all set.

Thank you for the help.