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Loop filter for HMC440 and HMC733 (sythentiser and VCO respectively)

Category: Datasheet/Specs
Product Number: HMC440; HMC733

I refer to the application circuit above from the datasheet of the HMC440 and will like to know the following:

1. I tried the several filters in ADsimPLL and the LT6200 seems to give the best phase noise performance. Is this a good choice of OpAmp or is a design as above limited to the THS4031 opamp as active filter?

2. Instead of the +/-5V for biasing the opamp, can I use a single bias of +10V and GND?

3. Any suggestions of a LDO or regulator that can be used with the opamp?