Well, you are not without options, but as other posters have aptly pointed out, the options that even approach what you are looking for are going to be pricey.
But will qualify "pricey", since you mentioned are using in professional environment. Then a realistic question is "how much is your data worth?" and that may change the initial question from asking about drive capacity to capacity and backup (or redundancy) options.
"Foremay...announced the world’s largest solid state drive with capacities up to ...1 TB for 2.5” SATA form factors....As the world’s highest capacity SSDs available, the EC188 M-series model-V flash hard drives are also bootable and support all major operating systems including...Mac" (
http://www.cdrlabs.com/News/foremay-ships-2tb-ec188-m-series-model-v-sata-ssd.ht ml). So, not sure if thus would fit nicely in the MBP, and I also find it rather unnerving when you have to email for a price quote ("For more information, please contact info@foremay.net")
Another option: 800GB (400GB+400GB) Newer Technology Guardian MAXimus mini Portable Extreme SSD FW800&400
USB2eSATA SATA Dual 2.5" SSD based Storage Solution. All interface Cables, Prosoft Data Backup, Intech HD SpeedTools included. 3 Year NewerTech Warranty. (NWTGM8QMSSD800) (
http://eshop.macsales.com/item/Newer%20Technology/GM8QMSSD800/).
And while this setup provides RAID 1 on the two 400GB SSDs apparently "For those seeking performance over redundancy, Guardian MAXimus mini can be easily switched via the LCD screen menu to the RAID-0 MAXPerform mode for up to 800GB of high speed performance storage."
No, its not going to fit nicely in the MBP, and that setup currently costs $3,299.99 (inline with "eww" ballpark figure for desktops). What would be neat, and I have no idea if possible, but could get 2 of these and use as RAID 0+1, "mirrored stripes". Of course, if that would work then are looking at about $6600 (not being flippant about the price, in some cases that may be a very realistic and acceptable figure for some data / environments).