I am 100% Flight-1 trained, all the way from 101, 102, 103, 201, 202 and now I do 1 on 1's, they are the best in the business. You are right in assuming that flight-1 is the way to go.
Your profile says 200 jumps in 3 years which means an average of 66 jumps per year. I highly doubt that a Flight-1 instructor will approve your choice of canopy. Please reference the following materials.
1. Canopy Downsizing chart by Brian Germain ( now adopted by USPA )
http://www.bigairsportz.com/pdf/bas-sizingchart.pdf
2. Canopy Risk Quotient by USPA
http://694m.be/skydive/canopy_risk_quotient
http://www.uspa.org/Portals/0/files/misc_sdriskquotient.pdf
If you put in your statistics HONESTLY you will find that you are already pushing the envelope way beyond what you should. Please stay there, or consider a more conservative approach ( preferred ).
Also to the best of my knowledge the stiletto has the shortest recovery arc in it's class of canopies and is designed for pilots wanting different things.
The recovery arc of the Sabre 2 is the longest in its class. ( I have no knowledge about the newly released Safire 3 )
In my opinion you would be better off at a same size sabre 2 and stay there until you can increase the total number of jumps that you are making per year. My recommendation would be minimum 200 jumps a year out of which half are hop and pop's.
PS --> I am not one of those people that believe that newer jumpers should not think about swooping, believe me I am one of the most impatient people out there, however I realized by competing in 4 way that there is no skipping of anythings when it comes to things that you do in the air. Your total time to become a shit hot swooper will always be greater if you REALLY nail down the fundamentals and get a proper canopy coach ( not your aff instructor that flies a valkyrie ).
Please do not hesitate to reach out to me if you have further questions.