There are lots of models available to do it, you'll just need to research which pins each shield uses to avoid any conflicts.I would probably pick the LCD/TFT shield first as the GSM shield can often be reconfigured.
He's actually on to something there, the GSM Shield doesn't play nicely with other instances of Software Serial. Probably could have solved the problem but I ended up using the Hardware Serial for my detachable LCD on something I built last year.
I might have missed something (probably rather than possibly!) but if the op is worried about CS then I take that to mean they are planning on using the SPI interface to talk to the display, and SoftwareSerial to talk to the GSM shield. I'm not aware of any compatibility issues between the two? I have had problems trying to use I2C with some GSM shields even though it wasn't supposed to be used.Multiple instances of SoftwareSerial do not play nicely together.