I have a dilema ????

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Should I do a minor or major upgrade ....I was on NewEgg window shopping and I put together a list of upgrades and was wondering if the $315.00 US is worth putting into my rig since I plan on building a Conroe system when DX10 and Vista are stable sometime in 07.I will be getting FSX Deluxe 10/27/06 as well.My current specs are on the Signature Line.I would appreciate all input.....Also my current CPU is a Northwood not a PrescottThanksAndyUpgrades :CPU Thermal Paste / Grease1 Arctic Silver 5 Thermal Compound - OEMModel #:ARCTIC SILVER 5Desktop Memory This will give me 2Gig 2 CORSAIR XMS 512MB 184-Pin DDR SDRAM DDR 400 (PC 3200) Desktop Memory Model CMX512-3200C2 - RetailModel #:CMX512-3200C2Fans, Heatsinks (Case, CPU, Chipset)1 ZALMAN CNPS7700-CU 120mm 2 Ball Cooling Fan with Copper Heatsink - RetailModel #:CNPS7700-CUHeadphone & Headset Accessories Keep wife out of my hair !!!!1 SENNHEISER PC 150 2 x 3.5mm Connector Circumaural Headset - RetailModel # C 150Processors1 Intel Pentium 4 3.0E Prescott 3.0GHz Socket 478 Processor Model RK80546PG0801M - OEMModel #:RK80546PG0801M