These two heads are somewhat similar: Ampeg SVTIII Pro 450 watts @ 4 ohms: Nice tone, hybrid tube pre and solid state power section. Some reviews say it doesn't sound like 450 watts. Warranty is transferrable. Yorkville XS400H 400 watts @ 4 ohms: Good power. Also nice tone, more tone shaping options than Ampeg, better warranty. Either of these would replace my very trustworthy Peavey Deltabass head. I play in a praise and worship band and would be powering a Peavey 115 BXBW (no tweeter) cab. I have heard both of these heads with 10's only and they both sounded great. Which one?