you can grip any board. remember that almost any board you buy for $100 will break pretty fast. Devotid makes high quality flat decks now for $130 which would be a good thing to start with. Also Sattelyte is making some cheaper but still super durable concaves this year for $215.
New wakeskates has $72.15 flat decks and you can put whatever graphic you want on it. http://newwakeskates.com/flatdecks.aspx
New wakeskates also has really good shaped concaves for around 120. http://newwakeskates.com/proskates.aspx
For under 150 your best bang for your buck is going to be a New Concave.