Taking a page from Bret Contreras, you can divide hamstring exercises into 4 types:
1. Semi-straight leg standing hip extension: RDL's, single leg RDL's, and good mornings
2. Straight leg prone and supine hip extension: back extensions, single leg back extensions, reverse hypers, single leg reverse hypers, straight leg elevated glute bridges, and single leg straight leg elevated glute bridges
3. Isolated knee flexion: Lying leg curls, seated leg curls, and single leg standing leg curls
4. Simultaneous hip extension and knee flexion: Russian leg curls, glute ham raises, stability ball leg curls, slideboard leg curls, single leg slideboard leg curls, slideboard bodycurls, suspended bodycurls, single leg suspended bodycurls, inverse hamstring curls, overhead 45 degree inverse hamstring curls
As a general rule, of those 4, you could rank #4 as the best, followed by #1, then #2, and in last place #3. My ranking is taking into account the different muscle fibers in the hamstring and what gets worked by the movements - something like #3 might only work the biceps femoris whereas #4 works all parts of the hamstring and gets the glutes for an added bonus.
In your proposed workout, you have 1 exercise for #1 and 2 for #3. RDL/SLDLs are fine (I don't like RDLs at all, personally), but I would also consider good morning variations, glute ham raises, russian leg curls, and suspended hamstring body curls (think stability ball leg curl, but your feet are resting on a bench and you're holding onto a barbell in a smith machine or suspension straps over a rack.
