P.S. I suggested the Ashdown as a louder personal monitor. Even 180W into 2x15 of a cheaper variety is going to be marginal to 1500. You'll still need FOH and loud on stage will be an issue.
An alternative is to go with IEMs. You can get a personal headphone monitor for £40 with dual xlr in to mix FOH and bass. I don't know if the Ampeg has a line out as well as DI, but if so you can connect easily. That is going wired IEM which will be cheaper if viable, but you'll need some good IEMs, for around £75.
An alternative is to go with IEMs. You can get a personal headphone monitor for £40 with dual xlr in to mix FOH and bass. I don't know if the Ampeg has a line out as well as DI, but if so you can connect easily. That is going wired IEM which will be cheaper if viable, but you'll need some good IEMs, for around £75.