You know how it is with the digital effects unit out there- they don't sound appealing plugged into a guitar amp. It gets more repulsive if your amp is a small, practice unit. However, for that same amount of money, you can invest in studio monitors which were conceived to manifest clarity & detail. So that's the story yesterday, I went down to the City Music year end sale to purchase the Kurzweil KS-40A; $95 for a pair of no-nonsense sonic liberation. My Line6 Pocket POD sounds superb through these, you'd do well to at least check them out at City Music, there are many monitors to consider for some worthy prices.
The chemistry with these monitors is that they possess drivers which are not instrument-biased. This means, the drivers are there to bona fide manifest whatever's plugged into them; the reason they sound superb with television, computers, music players, etc. Your digital effects units would highly likely contain amp & cab emulation patches which require a good source of voicing manifestation which is the specialization of these monitors. Just look at it this way- plugging in amp simulation into an amp- that's not quite a successful formula especially when it involves an overlap of inputs.