Proposed loop; GPU+CPU

Update: I've decided I'll get a new case for Christmas that's more suited for watercooling. Going to stick with what I've chosen except I'll swap the 120mm rad for a 360mm rad and hang it off the back of my case for the time being.

Hi, I'm currently looking at some options for putting my GTX 680 under water and was hoping I could get some advice/input from you gurus.

I bought the XSPC RS240 Raystorm kit about a month ago; http://www.frozencpu.com/products/16891/ex-wat-219/XSPC_Raystorm_750_RS240_Extreme_Universal_CPU_Water_Cooling_Kit_w_Free_Dead-Water.html?id=Bj8srdAQ&mv_pc=2105
and I was planning on using the radiator and water block that came with it.

My proposed parts to add to the loop;

120mm radiator; http://www.frozencpu.com/products/16235/ex-rad-409/Alphacool_NexXxoS_Monsta_Single_120mm_Radiator_-_80mm_Thick.html?id=Bj8srdAQ&mv_pc=2277#blank

Pump; http://www.frozencpu.com/products/6073/ex-pmp-53/Danger_Den_DD-CPX1_12V_3-Pin_Powered_Pump_-_DD-CPX1.html?tl=g30c107s153&id=Bj8srdAQ&mv_pc=2501
---I've read that the XSPC X2O 750 pump doesn't have enough power for an extra rad and block. Please correct me if that's wrong.

GPU water block; http://www.frozencpu.com/products/16975/ex-blc-1216/XSPC_Razor_nVidia_GTX_680_Full_Coverage_VGA_Block_-_Black_-_Reference_Design_new_style.html?tl=g30c311s1631&id=Bj8srdAQ&mv_pc=3251

Compression fittings; 12x http://www.frozencpu.com/products/13099/koo-289/Koolance_12_13mm_ID_x_58_16mm_OD_G14_Threaded_Nozzle_-_Black_NZL-V13-BK.html?id=Bj8srdAQ&mv_pc=2798
---I actually don't know exactly how many fittings I'll need (yeah, total noob ) but I figured two for each block, rad, pump and res.

For tubing I've got some generic solid black 5/8" x 1/2" from Lowe's.

Now for the questions: Does anything in that list not add up? I.e. will the pump be strong enough/will the radiators be adequate? I haven't chosen a reservoir yet. I was wondering if I could use the bay res that came with the Raystorm kit? I don't know if it's possible to remove the pump without damaging the res but if it's possible I'll be glad to do it.

Relevent data: My CPU is a 2500k @ 4.7GHz @ ~1.38v. When folding/prime95 it maxes out at 62C and averages 58C. My GPU is an EVGA GTX 680 @ 1249 core clock.
Everything involved for this build is in my sig rig "Botanical Dimensions" btw.

I've got a soft cap for my budget at $400 and a hard cap at $500 so feel free to point out anything that would net me some better performance that what I've selected.

Sorry in advanced if this is all a little jumbled up. I've been up for about 36 hours now
Edited by Shpongle - 10/27/12 at 8:41am

Thanks for the response. I was planning on mounting the DD pump on the bottom of my case and purchasing this reservoir;
http://www.frozencpu.com/products/9540/ex-res-153/Danger_Den_RAD-Reservoir_Internal_External_Liquid_Cooling_Reservoir_RES-005.html?id=KD7dbtM3&mv_pc=814

The only reason I wasn't planning on using my existing pump and res was the pump randomly lets off an annoying buzzing/humming noise. I suppose I could use what I have now and save that money for a better watercooling case. According to FrozenCPU the pump I have now actually pushes out 40 gallons/hour more than the danger den pump I had chosen so I should be in the clear.

As far as algae/bacteria growth goes I've got a silver kill coil and a 10:1 water:antifreeze mixture.

I've got 3 x http://www.newegg.com/Product/Product.aspx?Item=N82E16835553005 on the 240mm rad. Two pulling and one pushing (damn 8 pin CPU cable is preventing me from mounting another push fan). I haven't tried the Gentle Typhoon AP-15s yet but I've heard great things. I've been rocking these cougar fans for a while now and I love 'em. They push plenty of air and until they're ramped up past 80% they are dead silent.

Since I'm in the market for a better watercooling case I'll skip the 120mm rad for now. That will leave me with about $330 to blow on a case. Got any suggestions for that?

I'm based in Knoxville, Tn.
I was planning on something similar. Any case that can hold at least two 240mm rads will be more than enough for anything I'll have in it.
I'm currently using a Corsair 650D. I've thought about modding it to fit a 240mm rad in the front.
Case size isn't really important for me. I'll put casters on it anyways so it can weigh 80lb empty for all I care