I think the Citation rating offers the most use to you to build time. As mentioned Gulfstream jobs are dream jobs, usually offered to high time flyers and nephews of the CEO. The Citation type may be relatively cheap compared to others $5K-6K...but who among us that is just starting out has that kinda dough laying around.
The Citation is an honest jet, and if you've never flown jets before offers a great transitions from props to jets.
Best of Luck...keep us informed of what you decide and how training is going.
FF