Here is what I have thats positive on my report:
US Bank Secured - $3,000. 1-Year anniversary in December. Never late
Chase Auto Loan - $37K start. Under $20k left and ahead on payments
Sallie Mae Student Loan - Current and paying
NelNet Student Loan - Current and paying
NelNet Student Loan - Current and Paying
Scores below are as of today but I will see a boost at the end of the week. Will a 2nd card really be beneficial for me?
My plan is to send in another $2K next week to put my secured card at $5k till December when I call to try and get a PC on that card on the 12 month mark. If I do get the PC, that would put me with one card at a $5k CL. I am holding out to app for the Hyatt card from Chase when I get closer to 700. Thoughts?
Credit card board might be able to offer more advice on which one to get, but I do think you should get one more. Maybe a store card to boost your util?
012019 Fico8/Mortgage Score: 
You've listed the positive but what's the negatives holding your CS down?
Here is what is still holding me back.
This list shows the latest action. Been working on these accounts since Feb 2013. Had a collection from City of San Diego that has
OneMain Financial - Unpaid balance of $4,791. DOFD 5/12. PFD 10/10/13 Still no response from them on any letters I have sent them. Might try a DV.
Chase Auto - 4 30 lates and 1 60 day late. GW 10/28/13
Sallie Mae - Was 180 days late but now current.GW 10/28/13
Amazon Card - C/O $0 balance - DOFD 4/12. GW 10/28/13
Shell/Citi - C/O $0 balance - DOFD 4/12. GW 10/28/13
Cap1/Best Buy - C/O $0 balance - DOFD 4/12 EO Office Response 10/28/13
Cap1 Card #1 - C/O $0.00 Balance - DOFD 4/12 EO Office Response 10/28/13
Cap1 CC #2 - C/O $0 balance - DOFD 4/12 EO Office Response 10/28/13
Cap1 CC #3 - C/O $0 balance - DOFD 4/12 EO Office Response 10/28/13
Cap1 CC #4 - C/O $0 balance - DOFD 4/12 EO Office Response 10/28/13
Yes a second card would give you a better mix. IMO, I would wait until you get some responses back from your letters. If you are successful, the advice will be different. If unsuccessful, I would go with BoA or SDFCU for secured cc's. If you want to pick up a store card, just try the shopping cart trick. You dint need a bunch of cards, just one more.