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Although upgrading to 500 GB would buy us another year or two of time before reaching that capacity, we figured that (with the rate that we are continuing to load and store additional large photo files on our computer)  going to the largest hard drive that is made to fit in our Macbook Pro might be advisable?  Do not want problems with the new drive, that is for sure!  Our time machine back-up external drive is 3TB I think, so no limits there with how much we can back-up.  

1. and 2. below are the products I came up with when I searched the WD Caviar Black internal hard drive you mentioned our possibly ordering.  Neither sounds correct and the WD Caviar black series does not seem to be offered at all in the necessary 2.5 size for our computer~ only in a 3.5 size.  

Could not find any internal G drives, only external.  Did find 3. below.  Is this the best quality hard drive for us to order?

Still unsure what to order before proceeding with our appt.  If the 500 GB replacement internal drive you mention having in stock is the very best quality/reliable option existing out there over any available 750GB replacements, then I suppose we could go with that ~ but we would really love to go higher to around 750GB when doing this (if you think a really good quality replacement hard drive exists for our MacBook with that much storage).  

Will look forward to hearing your thoughts and any recommendations as to how we should next proceed/what to order.
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First and foremost, when dealing with drives never trust one.  I can't overstate this.  No matter what the age or make of the drive, you need to be prepared for it to fail at all times.  And don't be shocked when it does.  If you are prepared (by having backed up) then you can be at peace with the idea that your drive will die.  

Here are the two I would recommend.  
Newegg.com - Western Digital Scorpio Black WD7500BPKT 750GB 7200 RPM 16MB Cache 2.5" SATA 3.0Gb/s Internal Notebook Hard Drive -Bare Drive
Newegg.com - Seagate Momentus ST9750420AS 750GB 7200 RPM 16MB Cache 2.5" SATA 3.0Gb/s Internal Notebook Hard Drive -Bare Drive

I've seen them both fail but these fail less often than most other drives.  
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