Most similar sized SSD's are priced in a somewhat narrow range. However, there are a few things we have discovered over the years that affect SSD's which are rarely listed on the spec sheet.
One of those is that the companies that manufacture the chips take the cream of the crop for themselves, and sell off the rest of the chips to all the smaller companies that do not have multi-billion dollar fabs to produce their own.
The next thing is that only tiny number of companies can produce their own controller chips. These controllers literally control everything that's going on inside the SSD. Some controllers use a fair amount of power, and others just barely sip it, when idle. And since SSD's in the consumer space tend to spend the vast majority of their time doing nothing, idle power consumption is the important number for us.
I believe that Samsung is the only company that can produce every part that is used in building an SSD in their own factories. And over the years, they have produced very reliable SSD units. The units I listed for you, have 10 year warranties. Most SSD's have a 3 year warranty, and a few have a 5 year warranty.
In the system I built, I chose to install a 1Tb Samsung SSD, and not to have a hard drive at all. Its been a year now, and I love this drive.
Even the mighty Intel uses other companies controllers in their SSD's.
So I recommend Samsung SSD's. Seems lots of others here do as well.
Now the question about installing steam on the SSD and having games installed on another drive, yes. You can do that with hard drives, and you can do the exact same things a hard drive does with an SSD.
Prices can and do change on a daily basis. In addition, there are multiple models of SSD's, even from the same company. The first drive below was $104.89 the other day
Samsung 850 Pro Series 128GB 2.5" Solid State Drive
$99.99 $99.99 Amazon
The second drive I originally posted the other day actually dropped to $114 2 days ago, but its back to where it started now.
And this these 2 drives are using a triple cell storage technology instead of double cell used on the above drives.
Samsung 850 EVO-Series 120GB 2.5" Solid State Drive
$69.75 $69.75 OutletPC
Samsung 850 EVO-Series 250GB 2.5" Solid State Drive
$117.88 $117.88 OutletPC
Its all just food for thought. If you prefer the Intel SSD, its a good unit too.