Based on the information you provided, it seems like the processor (i5-6500) and motherboard (MSI H110M Pro-VH Plus) are not ideal for the GPU (1650) you have in mind. Here are some points to consider in making your decision:
1. Compatibility and Bottlenecking: The i5-6500 may not be able to fully utilize the potential of the GTX 1650, leading to a bottleneck where the GPU's performance is limited by the CPU. Upgrading the CPU to a more powerful one would be beneficial for better performance without bottlenecks.
2. Future Upgradeability: If the motherboard is not upgradeable and you are considering future upgrades, it may not be the best choice for long-term use. Upgrading both the CPU and GPU in the future might require a new motherboard as well.
3. Negotiation with the Seller: If the seller is firm on the fixed price but you are not satisfied with the components, you can try negotiating by explaining your concerns about the bottlenecking issue and the lack of upgradeability. If the seller is unwilling to lower the price, you might need to consider whether the full set is still worth it to you.
4. DIY Upgrade: If you are comfortable with dismantling the components, you could consider buying the full set and upgrading the CPU and motherboard yourself. This way, you can choose components that are more suitable for your needs.
In conclusion, it's essential to weigh the pros and cons of purchasing the full set with the current components versus the potential for future upgrades and performance. If the fixed price doesn't align with the value you see in the system, it might be worth exploring other options or negotiating further with the seller.