The issue with caching is that you have basically no control over what gets stored on the SSD cache. I decided to choose two SSD's in this instance. The first one can be used for the OS, and the second one for caching. Instead of 16GB of ram, I put in 32GB, but you have room too add 64GB if you wanted. I picked 2x 4TB Hard Drives which you could Raid 0, or if you want you can either spend a little more money and do 2x 8TB drives in Raid 1 so you have redundancy. Or you can do 1 8TB Hard drive if you're just downloading movies then I wouldn't worry too much. Also 10700F will probably be enough for you're needs, if you feel you need the extra horsepower, I would go for either a 10900F, or a 10700KF. If you chose the 10700KF You need at least a Noctua D15 or a AIO Cooler. For the record, the F in the processor means no dedicated graphics. Which means you would have to use you're 750Ti.
PCPartPicker Part List: https://de.pcpartpicker.com/list/jRrtGq
CPU: Intel Core i7-10700F 2.9 GHz 8-Core Processor (€266.92 @ Mindfactory)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (€34.94 @ Aquatuning)
Motherboard: Asus PRIME B460-PLUS ATX LGA1200 Motherboard (€110.95 @ Amazon Deutschland)
Memory: G.Skill Ripjaws V Series 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory (€148.90 @ Amazon Deutschland)
Storage: Samsung 970 Evo Plus 250 GB M.2-2280 NVME Solid State Drive (€67.62 @ Amazon Deutschland)
Storage: Samsung 970 Evo Plus 250 GB M.2-2280 NVME Solid State Drive (€67.62 @ Amazon Deutschland)
Storage: Western Digital Red 4 TB 3.5" 5400RPM Internal Hard Drive (€99.90 @ Amazon Deutschland)
Storage: Western Digital Red 4 TB 3.5" 5400RPM Internal Hard Drive (€99.90 @ Amazon Deutschland)
Case: Corsair 270R ATX Mid Tower Case (€58.27 @ Amazon Deutschland)
Power Supply: Corsair RM (2019) 750 W 80+ Gold Certified Fully Modular ATX Power Supply (€104.39 @ Alza)
Total: €1059.41
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2021-06-30 06:53 CEST+0200
Edit: The 10700 and 10700KF has 8 Cores, the 10900F is 10 Cores.