If one were to get a MBP with the standard Serial ATA Drive, could it later be replaced with SSD? I've never seen an SSD drive, I'm wondering if the conector is the same as Serial ATA?

I'm thinking I might just get the standard drive and upgrade it aftermarket.

I've done this with the two MBP's we have at our house. It was very simple (around 8 screws). Just make sure you have a tiny screwdriver set (like those used for glasses). You can usually search for macbook screwdriver and find ones that work for <$10

> I've never seen an SSD drive, I'm wondering if the conector is the same as Serial ATA?

Yes, modern off-the-shelf SSDs in a normal package use SATA (what else would they use?).

They look exactly like your standard 2.5" drive, except without breathing holes and sometimes thinner with a spacer to reach normal 2.5" height.

To see what SSDs look like, just click around in Anandtech's storage articles category[0], just ignore PCI-E SSDs (they're a bit of a special case)

[0] http://www.anandtech.com/tag/storage

Yes, many SSD's use SATA.