Iphone 5 logic board replacement?

I recently woke up to a water damaged phone and attempted to get it fixed by a friend. He was not able to fix it. He replaced the battery and charging dock which to me means it has to be the logic board. I took the phone apart and cleaned it with 70% alcohol and it still does not work. I don't see any signs of corrosion.

I'm going to attempt to replace the logic board but I'm confused as to which one to get.

I searched on eBay and there are $150 ones that come with chips and $20 ones that are bare. Does it matter which one I get? And if I get the bare one will the old chips from the old logic board still be good?

Using an iPhone 3GS in 2014?

Using an iPhone 3GS in 2014?

Added (1). I have been using the iPhone 3GS ever since 2010. I have broken it a few times, but just spent £30 getting a new one.
I have about 200GBs of music and to me getting a new iPhone 8GB is usually cause I'm going to have 4GBs by the time the OS and pre installed apps are on there.
I own a 32GB iPhone 3GS - White.
If I was to get an iPhone it would have to have more then 32GBs of storage space so I could put a few playlists on there.

Added (2). Is there any need to upgrade a phone?
It does what I want it to do like phone, text, surf the internet, read e-mails, even supports up to date apps.
And yes it take forever to open Facebook Messenger (about 10 minutes and crashes multiple times) but I'd rather have patients then go blow £800 or whatever crazy money on a new iPhone.
I'm just thinking of getting an iPod Classic 180GB and keep my iPhone 3GS.
For the price of a brand new iPhone, I could buy a Macbook Air!

Straight Talk 4G LTE iPhone 5c?

I bought an AT&T iPhone 5c and I'm using it with Straight Talk. I have the AT&T compatible SIM card from Straight Talk. My phone shows a 3G connection and I don't have the option to edit my APN or anything like that. How do I get a 4G LTE connection on my phone?

*Phone is LTE capable
* SIM card is LTE capable

Why can't I play gba roms on my iphone 5s?

I download it but it downloads halfway then just stops. I tried leaving it for 10 minutes but it just keeps restarting the download. I've tried putting the date back a day, a month, a year, I've tried everything, it just keeps restarting the download. Also, this is the rom I'm downloading here. It used to work a few months ago, but now it doesn't. No my phone is not jailbroken, and I download the nonjailbroken version.

IPhone 4s power button not working but proximity sensor does?

My iPhone 4s has an issue with its power button. I had it replaced because the button was completely dead and the proximity sensor was unresponsive too. Now its been replaced the proximity sensor works great and the power button clicks but nothing happens when its pressed. I should mention that my iPhone is out of warrenty too. Any ideas why it might be doing this? I'm so sick of having to use assistive touch to lock my screen and once booted down having to resort to plugging my iPhone onto charge to reboot anyone else had this issue?

How long is 2-3 business days?

I just ordered a iphone 5c from verizon and the told me i had to wait 2-3 business days. How long is that? Should i sit at my front door and wait for the phone? I'm just so excited and i don't want to wait!