If you want a GOOD lamp for about 5-6 plants, your budget is already maxed out. You might be able to snag some deals on eBay since many have given up on growing =D it should be at least 300 watts or 2 x 150 watts. Best to get one that can be dimmed. As for the tent, everyone trains their plants differently... if you just want to let them grow, you'll need a bit more space for 5-6 plants. Do you already have exhaust and fans? The tent size also depends a bit on that.