DDR2 800 choices to a <1.95v output motherboard

Hello everybody. I'm from Brazil and registered today in Tom's Hardware Forums.

Having in mind that a lot of people own ASUS M2N-E SLi and other motherboards with 1.95v limit, I decided to list all DDR2 800mhz non-Value Dual Channel (2GB and 4GB) memories showing that there are good options at <1.95v.

DDR2 800mhz 4GB (2x2GB)
Model | Latency (CAS-TRCD-TRP-TRAS) | Voltage (v) | Link
Kingston HyperX | 4-4-4-12 | 1.95 | http://www.valueram.com/datasheets [...] LK2_4G.pdf
GeiL Evo One | 4-4-4-12 | 1.9-2.0 | http://www.geilusa.com/products/showSpec/id/125
GeiL Esoteria Rev2 | 4-4-4-12 | 1.9-2.5 | http://www.geilusa.com/products/showSpec/id/128
Transcend aXeRam | 4-4-4-12 | 1.8 |
GeiL Black Dragon | 5-5-5-15 | 1.9-2.4 | http://www.geilusa.com/products/showSpec/id/115
G. Skill P Q | 5-5-5-15 | 1.8-1.9 | http://newgskill.web-bi.net/bbs/vi [...] =asc&no=95
OCZ Gold Vista Performance | 5-5-5-15 | 1.8 | http://www.ocztechnology.com/produ [...] al_channel
Corsair XMS2 DHX | 5-5-5-18 | 1.9 | http://www.corsair.com/_datasheets [...] 0C5DHX.pdf
OCZ Reaper HPC Edition | 5-5-5-18 | 1.8 | http://www.ocztechnology.com/produ [...] gb_edition
Corsair XMS2 | 5-5-5-18 | 1.8 | http://www.corsair.com/_datasheets [...] 6400C5.pdf
OCZ Vista Upgrade | 5-6-6-18 | 1.8 | http://www.ocztechnology.com/produ [...] le_4gb_kit

DDR2 800mhz 2GB (2x1GB)
Model | Latency (CAS-TRCD-TRP-TRAS) | Voltage (v) | Link
GeiL Ultra Plus | 3-3-3-8 | 1.9-2.3 | http://www.geilusa.com/products/showSpec/id/68
OCZ Special OPS Edition Urban Elite | 4-4-3-15 | 1.9-2.1 | http://www.ocztechnology.com/produ [...] rban_elite
GeiL Esoteria | 4-4-4-12 | 1.9-2.5 | http://www.geilusa.com/products/showSpec/id/112
GeiL Black Dragon | 4-4-4-12 | 1.9-2.4 | http://www.geilusa.com/products/showSpec/id/115
GeiL Ultra | 4-4-4-12 | 1.9-2.3 | http://www.geilusa.com/products/showSpec/id/65
GeiL EVO One | 4-4-4-12 | 1.9-2.0 | http://www.geilusa.com/products/showSpec/id/128
Transcend aXeRam | 4-4-4-12 | 1.8 | http://www.transcendusa.com/Suppor [...] K_2345.pdf
OCZ Platinum Rev2 | 4-4-4-15 | 1.9-2.1 | http://www.ocztechnology.com/produ [...] al_channel
OCZ Gold GX XTC Rev2 | 4-5-4-15 | 1.95-2.1 | http://www.ocztechnology.com/produ [...] al_channel
Corsair XMS2 PRO | 5-5-5-12 | 1.9 | http://www.corsair.com/_datasheets [...] 400PRO.pdf
G. Skill N R | 5-5-5-15 | 1.8-2.0 | http://newgskill.web-bi.net/bbs/vi [...] =asc&no=99
G. Skill N Q | 5-5-5-15 | 1.8-2.0 | http://newgskill.web-bi.net/bbs/vi [...] =asc&no=97
OCZ System Elite | 5-5-5-15 | 1.8 | http://www.ocztechnology.com/produ [...] al_channel
OCZ Vista Upgrade | 5-5-5-15 | 1.8 | http://www.ocztechnology.com/produ [...] le_2gb_kit
Corsair XMS2 DHX | 5-5-5-18 | 1.8 | http://www.corsair.com/_datasheets [...] 0C5DHX.pdf

PS.: I haven't found any Crucial and Patriot non-Value models under 1.95v.
PS[2]: I would like a help to list all <1.95v motherboards.
PS[3]: I have these data in Excel format too: http://www.zshare.net/download/1023795187ddc96a/

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Now I am going to my particular problem.
My config is: ASUS M2N-E SLi, AMD Athlon64 X2 3800+, XFX GeForce 8600GT XXX, Kingston ValueRAM DDR2 667mhz 1GB, WesternDigital Caviar 80GB IDE, Huntkey GS450W, Samsung 932BW, WinXP Professional SP2 x86.
My use in PC is:
Designer (CorelDraw, Adobe CS3, etc); Soft~Mid Gamer (NFSS, FIFA, NBA, BF, CS, etc) ; Internet (browser w/ nearly 10 tabs opened + MSN + WMP) ; Soft Overclocker (X2 3800+ @2.2ghz, and some anothers i will make).
I will make a upgrade in the RAM and HD. I decided for the HD Seagate Barracuda SATA II 7200.11 500GB 32mb, is it a good choice?.
For the RAM, I have 3 options:
a) Buy a 4GB kit and upgrade to a 64bits OS.
b) Buy a 4GB it but keep WinXP x86 for better compatibility with drivers, smaller programs, etc
c) Buy a 2GB kit to get better models for the money (for sample: OCZ Special OPS).

Which option should I choose? What RAM should I buy and what OS should I use?

Thank you for reading.

Hi Jpain.
Thank you for reply!
I posted the same doubt in some brazilian forums, and all the answers were the option a).
Veery probably i'll pick the Seagate, a 4gb kit and install Vista Ultimate 64.
But I still very doubtful about the memory.
I liked very much these four models:
Kingston HyperX 4-4-4-12 1.95v
GeiL Evo One 4-4-4-12 1.9-2.0v
GeiL Esoteria Rev2 4-4-4-12 1.9-2.5v
Transcend aXeRam 4-4-4-12 1.8v

For soft overclocking (I will up my 3800+ to 2,2 ~ 2,4ghz), which model should I choose?

Thanks in advance