Threat Set - stats comparisions?

[Telison]

I am currently working on a threat set. My tanking gear so far has had a big survivability focus. Now the three obvious stats to shoot for in a threat set are:

Hit Rating
Expertise
Shield Block Value

Now, I have a hard time comparing these values to each others. Has anyone done any such testing or computing? If so a link to any resources would be great. For example how much SBV would 1 hit rating be comparable to in a TPS sense. I understand that this of course would depend on your DPS and how often you use shield slam etc. But still...

20 hit rating, 40 SBV, what would you pick?

[Ferro]

From my own threat comparison spreadsheet.....

Relative Threat Comparisons:

Total TPS: 815.2

The following will add approx. 11 TPS with current gear setup:
1. 2% Threat enchant gloves
2. 50 SBV (raw before talented 30% bonus)
3. 200 AP
4. 44 Crit rating (2%)
5. 10 exp rating (.63%)
6. 20 hit rating (1.27%)
7. 66 agility

The following will add approx.18 TPS with current gear setup:
1. T6 4 piece bonus

The following will add approx.15 TPS with current gear setup:
1. Increasing weapon dps by 10
2. Decreasing weapon speed by 0.1