so my bike build is going to cost me a LOT more than the initial £1000 budget id set myself

, so far ive spent just under £800 and all ive got is
- Giant Reign Frameset
- Full Respray on above frame
- new bearing set for frame
- Avid Elixir Brakeset
- Rockshox Tora 302's (not the best for this frame but ill be upgrading next year)
- Truvativ 60mm stem
- FSA 282 bars
- Superstar AM490 wheelset with Ti skewers
- KCNC seatclamp @ only 10g!!!!
- SDG Bel Air saddle
- SLX Shifter combo
- Superstar Lockons
i had planned on puting an SLX double on for the crankset but they've rocketed up in price

, can anyone recommned me a decent alternative? must be external BB
also need some suggestions for rear mech and cassette
also whats everyones thoughts on brake rotor sizing? on my hardtail i run 180/160 but was looking at a 203/180 option for the reign? is this overkill
im also trying to save weight where i can but money also has a deciding factor