IMO my rig is a really good bang for the buck. I use a tech 21 sans amp RBI pre amp, swr power amp and ampeg classic 410he or 810e. Just make sure whatever power amp you get is a good match for whatever cab you get. For example the ampeg 410he is a 8 ohm cab. So if you get a low powered head or power amp youll be better off getting a small 4ohm cab instead
Sans amp RBI about $300 new (get a sans amp pedal if money is tight)
Power amp can be just about anything. ( i use the power section of an swr head i had sitting around)
Ampeg 410he can be found for $500-$600 new, ampeg 810e is about a $1,000 new but is much much cheaper used, I've seen the 810s sell for $200 at times because people don't have the vehicles to move them.
My rig is great for all styles. If i want to play rock or metal i set the blend on my sans amp so its about 60% wet/40% dry. If i want a dryer cleaner sound i just turn the blend knob down.
I was really Into swr, Eden, Mesa and more "high end" stuff for years but I've opened for dozens of signed rock/metal bands and they always have sans amps. Most use the BDDI, PSA, RBI, or RPM. Most of the bands you see using ampeg svt4 actually just use them as a power amp and use the sans amp as their pre amp instead of the pre amp on the ampeg head.
If you want to go all tube, which is another nice way to go. Check out peaveys all tube heads. They sound great and are much more affordable than an all tube svt or Mesa 400.