Need help with buying bass head...
 

So I wanna buy Peavey Tour 450(played one gig on her and a was like I must buy it).I have cab who i made and its 1X15",8ohm,150W...I want to ask you guys can that be a nice combination for gigs ?

I personally think that head is too much for that cab there are plenty of inexpensive cabs you could pair with that head and have a great Rig.

The amp is fine. The limitation of it will be your cab, and that's where volume comes from. A bigger more efficient cab will get pretty loud, but a single 8 ohm 1x15 will only go so far. Don't push it further than it's happy. If it starts to sound "farty", you've reached it's limit.

The Hartke 3500 is a pretty good amp and you can find lots of used ones at good prices.

It is rated at 350W into 4 ohms and 200W into 8 ohms.

I'd go with this over the peavey any day of the week.