I would second looking at class D amps, you can get a taste of them for very little money.
I have several based on the Texas Instruments TPA series chips. I find they sound better than my low cost, low wattage tube amps. I would suggest looking at amps with the TPA3250/TPA3255 or TPA3116/TPA3118 chips. There are many boards you can buy to build your own. There are also cheap and inexpensive pre-built versions.
For pre-built, take a look at the FX502SPRO, Allo Volt +D, or even the Nobsound dual TPA3116 for really cheap.
At that low of cost, it is worth give it a listen. Enjoy!