Theres not really any point to OCing memory, it won't gain you much performance at all. Though it can be fun. I got my G.Skill Ripjaws 1600MHz "8-8-8-24 to 1830MHz 8-8-8-24" and to "1400MHz 5-6-5-20". I didn't do it to gain performance just for fun, you shouldn't really go out and buy Dominators just because you want to OC though.
When your looking at memory there is frequency (MHz) and latency (eg 9-9-9-24). Neither of these give you much performance with frequency giving you basically nothing beyond 1333MHz. Latency does give you some performance though which is what it is for.
High frequency RAM is for OCing the CPU. You see when you OC a CPU the RAM speed increases, after too much of a CPU OC the RAM might not be able to run under or at 1333MHz. Instead it is pushed above this (its rated speed) and is "Overclocked". This can limit a CPU OC as the RAM will soon become too fastly clocked to run stable.
That is the main reason why people buy RAM which is clocked faster then 1333MHz. Though in your case this CPU OC does not apply, this is because you have a "Black Edition" CPU. What this means is that the CPUs multiplier can be raised, if you do this the CPU speed will increase but the RAM speed will stay the same. Therefore 1600MHz is not "really" required for you.
With latency don't pay too much for lower timings, stay in your budget. Though it does not cost that much for lower timings.
I would suggest going with the Phenom II X4 955 if you are going to be OCing it. You can easily clock the 955 up to the speeds of the 965 and 970, yet it is much cheaper. Also are you getting an aftermarket cooler?
Here is some good 1333MHz 9-9-9-24 memory to look at for $72:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226092&cm_re=mushkin_1333-_-20-226-092-_-Product
1600MHz RAM cost a whole $13 more so I would discourage it, if you want to spend some more money go for lower latency.
For a motherboard you need to be more specific. Do you need/want USB/SATA 3.0, are you expecting to SLI, are you expecting to switch to ATI and Crossfire...
Anyway heres a nice board if you don't need SLI (I would discourage it) $100:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131649&cm_re=880g-_-13-131-649-_-Product
Why go with a 32 bit OS? You already have it?
Hope that helps.
[EDIT]
Fixed a few errors.