As a comparison, I renovated a 3/2.5 home, which totaled to 1,800 SF, in CT back in early-mid 2015. I When I run what I spent it came out to $40,900 for materials and sub labor. I then paid my father $12,000 for his managing and work. All total it was basically $53,000 to renovate what sounds like a similar situation (house wise). I did most of the grunt work myself, over roughly 5-6 months, working 4-5 nights a week.
Had a paid a true GC and not done the work I did, I would have to easily add $15,000 to what it cost. This puts it not far off where you are coming in for renovation costs.
Keep in mind I am being very basic with my math here, and can only speak from one flip. The absolute best thing to do when dealing with a GC and subs, is to create scope sheets/lists for them. Have them fill it out (check lists of exactly what you want done) and also give them areas to fill out additional work they explain is needed. You may think the roof needs $500 in "repairs", yet no roofer will put his name on a $500 fix, to a 25 year old roof that needs replacement in his eyes. In that case, you might be in a tough spot. You either find a handy-man to fix as you wish, or break the budget and replace the roof.
Mechanicals might be the same. You see a decent furnace/boiler and think it needs clean and some repair, yet a licensed HVAC company will not work on a 25 year old item, and will only replace. In these cases, you may have to either rethink your strategy, or lower budgets elsewhere to overcome these needs.
Here is my thought. Take a few hours and write complete, room by room scope of work. Be exact. Ex:
Bedroom:
Remove carpet, tack strips, and fasteners, and dispose.
Remove padding and any glue residue and dispose.
Remove existing doors, hinges, strikes and locksets. locksets and hinges to be reused, dispose of doors.
Remove existing light fixtures, outlets and switches and dispose.
Patch all wall/ceiling dings, dents and imperfections.
Sand patches, prime one coat and paint two coats on all walls.
Sand patches, prime one coat and paint two coats on ceilings.
Prep, prime and 2 coats paint all window jambs, sills and trim.
Prep, prime and 2 coats paint all door jambs, and trim.
Prep, prime and 2 coats paint base moulding.
Furnish, paint and install interior, H.C. doors at closet and bed to hallway. Furnish and install brushed nickel passage set at closet and privacy set at door to hall. F&I hinges. Cost savings to reuse existing handles and hinges removed during demo.
Furnish and install 3 prong white outlets and covers at all existing boxes. Including proper grounding to code.
Furnish and install white light switch at existing box.
Furnish and install flush mount, brushed nickel two bulb light fixture at existing light fixture location. Provide bulbs.
Furnish and install carpet, 8lb pad, and all tack strips throughout bedroom and closet. Carpet shall be of Xxx quality, and color chosen by owner.
Vacuum carpet, clean windows and general wipe down of room once completed.
This list above looks anal, and it very well is. However, if I were paying someone to complete an entire project for me, I would be absolutely clear on what I want done. I would have included and excluded check boxes and ask for explanations of what's not included and why. I would be open to cost savings ideas from them (using cheaper items others may not see, left over items he may have, reusing items in the house etc.) and discuss this up front. What this does is level the G.C.s and has you driving the bus in regards to what you foresee happening. Its also a tool if a later change order comes up. You come back to this list (the list also turns into your contract) and if its shown and included, you have more leverage that he owned what he owned.
Sorry to be long winded, however I think you can revamp your wants/needs, and cut your proposals down some by doing this.