I have a 2.360 from Walmart. Works just fine $120. All Karcher pressure washers will require an adapter for an AG/MTM Hydro style foam lance (except for gas models). The adapter is $15 and available separately from AG or is included with their foam lance. Karcher makes a foam lance that is a direct fit and requires no adapter. I have it, it's not very good. All electric Karchers have the same fittings, so it doesn't matter what model you get.
The other thing is, I found it a real pain to try and use the stock 25 foot hose. It won't fit all the way around a truck. Super Walmart also sells a Karcher extension pressure hose that will double your hose to 50 feet. I highly reccomend that also.