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What's your budget range roughly, and are you looking to power just the doors or planning to add a sub later? For door speakers specifically, a compact 4-channel amp in the 50-100 watt range per channel will handle most aftermarket speakers without breaking the bank - brands like Rockford Fosgate, Alpine, and Kenwood have solid budget options. The main thing is making sure it fits your car's space and that you've got proper wiring sorted, since a cheap install can waste a decent amp.
Most compact car amps in the 100-200 watt range run between $100-300 and handle door speaker upgrades without needing a full system overhaul. Brands like Rockford Fosgate, Alpine, and Kenwood have solid budget options that won't require massive rewiring or a second battery. Just make sure your car's electrical can handle it and grab a decent amp kit with proper gauge wiring - cheap wiring is where people screw up the whole install.
Door speakers alone don't really need a dedicated amp unless you're going high-end - most factory head units push enough watts for decent aftermarket door speakers without one. If you do go the amp route though, watch out for the wiring nightmare: running power and ground cables through your car's firewall is way more of a pain than folks realize, and a lot of budget amps come with cheap cabling that'll give you headaches down the road.
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